Bump version to 2.6.0 (#5820)

*Motivation*

Bump the development version to 2.6.0-SNAPSHOT
diff --git a/distribution/io/pom.xml b/distribution/io/pom.xml
index 3cd6d7a..d9f7919 100644
--- a/distribution/io/pom.xml
+++ b/distribution/io/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>distribution</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/distribution/offloaders/pom.xml b/distribution/offloaders/pom.xml
index 825a830..22dbfb2 100644
--- a/distribution/offloaders/pom.xml
+++ b/distribution/offloaders/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>distribution</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/distribution/pom.xml b/distribution/pom.xml
index 862e5ee..0eb0da1 100644
--- a/distribution/pom.xml
+++ b/distribution/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>pulsar</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/distribution/server/pom.xml b/distribution/server/pom.xml
index 6fd5e5d..abf569f 100644
--- a/distribution/server/pom.xml
+++ b/distribution/server/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>distribution</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
     <relativePath>..</relativePath>
   </parent>
 
diff --git a/docker/grafana/pom.xml b/docker/grafana/pom.xml
index 0a33657..19a1617 100644
--- a/docker/grafana/pom.xml
+++ b/docker/grafana/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>docker-images</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.pulsar</groupId>
diff --git a/docker/pom.xml b/docker/pom.xml
index b198698..f5f4d4b 100644
--- a/docker/pom.xml
+++ b/docker/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>pulsar</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <groupId>org.apache.pulsar</groupId>
   <artifactId>docker-images</artifactId>
diff --git a/docker/pulsar-all/pom.xml b/docker/pulsar-all/pom.xml
index 00bba50..9fa3f93 100644
--- a/docker/pulsar-all/pom.xml
+++ b/docker/pulsar-all/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>docker-images</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <artifactId>pulsar-all-docker-image</artifactId>
diff --git a/docker/pulsar-standalone/pom.xml b/docker/pulsar-standalone/pom.xml
index 2fb1073..6d63e05 100644
--- a/docker/pulsar-standalone/pom.xml
+++ b/docker/pulsar-standalone/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>docker-images</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.pulsar</groupId>
diff --git a/docker/pulsar/pom.xml b/docker/pulsar/pom.xml
index 4af9a77..6bb018c 100644
--- a/docker/pulsar/pom.xml
+++ b/docker/pulsar/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>docker-images</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.pulsar</groupId>
diff --git a/tests/bc_2_0_0/pom.xml b/tests/bc_2_0_0/pom.xml
index 2b87559..2619d44 100644
--- a/tests/bc_2_0_0/pom.xml
+++ b/tests/bc_2_0_0/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.apache.pulsar.tests</groupId>
         <artifactId>tests-parent</artifactId>
-        <version>2.5.0-SNAPSHOT</version>
+        <version>2.6.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>bc_2_0_0</artifactId>
diff --git a/tests/bc_2_0_1/pom.xml b/tests/bc_2_0_1/pom.xml
index d12d3af..67e7621 100644
--- a/tests/bc_2_0_1/pom.xml
+++ b/tests/bc_2_0_1/pom.xml
@@ -25,7 +25,7 @@
     <parent>
         <groupId>org.apache.pulsar.tests</groupId>
         <artifactId>tests-parent</artifactId>
-        <version>2.5.0-SNAPSHOT</version>
+        <version>2.6.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>bc_2_0_1</artifactId>
diff --git a/tests/docker-images/java-test-functions/pom.xml b/tests/docker-images/java-test-functions/pom.xml
index 4889049..aad909b 100644
--- a/tests/docker-images/java-test-functions/pom.xml
+++ b/tests/docker-images/java-test-functions/pom.xml
@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.apache.pulsar.tests</groupId>
         <artifactId>docker-images</artifactId>
-        <version>2.5.0-SNAPSHOT</version>
+        <version>2.6.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.apache.pulsar.tests</groupId>
diff --git a/tests/docker-images/latest-version-image/pom.xml b/tests/docker-images/latest-version-image/pom.xml
index 7a7e6d2..b0c3f76 100644
--- a/tests/docker-images/latest-version-image/pom.xml
+++ b/tests/docker-images/latest-version-image/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.pulsar.tests</groupId>
     <artifactId>docker-images</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
   <groupId>org.apache.pulsar.tests</groupId>
diff --git a/tests/docker-images/pom.xml b/tests/docker-images/pom.xml
index 4732e48..ca052a2 100644
--- a/tests/docker-images/pom.xml
+++ b/tests/docker-images/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.pulsar.tests</groupId>
     <artifactId>tests-parent</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <groupId>org.apache.pulsar.tests</groupId>
   <artifactId>docker-images</artifactId>
diff --git a/tests/integration/pom.xml b/tests/integration/pom.xml
index 3376cfb..717ecea 100644
--- a/tests/integration/pom.xml
+++ b/tests/integration/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar.tests</groupId>
     <artifactId>tests-parent</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
 
   <artifactId>integration</artifactId>
diff --git a/tests/pom.xml b/tests/pom.xml
index c6844e5..6f3b3f9 100644
--- a/tests/pom.xml
+++ b/tests/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.pulsar</groupId>
     <artifactId>pulsar</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
   <groupId>org.apache.pulsar.tests</groupId>
   <artifactId>tests-parent</artifactId>
diff --git a/tests/pulsar-kafka-compat-client-test/pom.xml b/tests/pulsar-kafka-compat-client-test/pom.xml
index 0119d32..e0f6bf7 100644
--- a/tests/pulsar-kafka-compat-client-test/pom.xml
+++ b/tests/pulsar-kafka-compat-client-test/pom.xml
@@ -25,7 +25,7 @@
   <parent>
     <groupId>org.apache.pulsar.tests</groupId>
     <artifactId>tests-parent</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
 
   <artifactId>pulsar-kafka-compat-client-test</artifactId>
diff --git a/tests/pulsar-spark-test/pom.xml b/tests/pulsar-spark-test/pom.xml
index b43477b..3d286cb 100644
--- a/tests/pulsar-spark-test/pom.xml
+++ b/tests/pulsar-spark-test/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.pulsar.tests</groupId>
         <artifactId>tests-parent</artifactId>
-        <version>2.5.0-SNAPSHOT</version>
+        <version>2.6.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>pulsar-spark-test</artifactId>
diff --git a/tests/pulsar-storm-test/pom.xml b/tests/pulsar-storm-test/pom.xml
index 584280d..c21ee88 100644
--- a/tests/pulsar-storm-test/pom.xml
+++ b/tests/pulsar-storm-test/pom.xml
@@ -26,7 +26,7 @@
   <parent>
     <groupId>org.apache.pulsar.tests</groupId>
     <artifactId>tests-parent</artifactId>
-    <version>2.5.0-SNAPSHOT</version>
+    <version>2.6.0-SNAPSHOT</version>
   </parent>
 
   <artifactId>pulsar-storm-test</artifactId>