Upgrade nacos version to 2.0 (#302)

diff --git a/dubbo-samples-nacos/dubbo-samples-nacos-conditionrouter/case-configuration.yml b/dubbo-samples-nacos/dubbo-samples-nacos-conditionrouter/case-configuration.yml
index f9f69d7..c336daf 100644
--- a/dubbo-samples-nacos/dubbo-samples-nacos-conditionrouter/case-configuration.yml
+++ b/dubbo-samples-nacos/dubbo-samples-nacos-conditionrouter/case-configuration.yml
@@ -16,7 +16,7 @@
 
 services:
   nacos:
-    image: nacos/nacos-server:1.4.0
+    image: nacos/nacos-server:2.0.0
     environment:
       - PREFER_HOST_MODE=hostname
       - MODE=standalone
diff --git a/dubbo-samples-nacos/dubbo-samples-nacos-configcenter/case-configuration.yml b/dubbo-samples-nacos/dubbo-samples-nacos-configcenter/case-configuration.yml
index ea897f4..1384b21 100644
--- a/dubbo-samples-nacos/dubbo-samples-nacos-configcenter/case-configuration.yml
+++ b/dubbo-samples-nacos/dubbo-samples-nacos-configcenter/case-configuration.yml
@@ -16,7 +16,7 @@
 
 services:
   nacos:
-    image: nacos/nacos-server:1.4.0
+    image: nacos/nacos-server:2.0.0
     environment:
       - PREFER_HOST_MODE=hostname
       - MODE=standalone
diff --git a/dubbo-samples-nacos/dubbo-samples-nacos-override/case-configuration.yml b/dubbo-samples-nacos/dubbo-samples-nacos-override/case-configuration.yml
index 8cffd7d..9641c02 100644
--- a/dubbo-samples-nacos/dubbo-samples-nacos-override/case-configuration.yml
+++ b/dubbo-samples-nacos/dubbo-samples-nacos-override/case-configuration.yml
@@ -18,7 +18,7 @@
 
 services:
   nacos:
-    image: nacos/nacos-server:1.4.0
+    image: nacos/nacos-server:2.0.0
     environment:
       - PREFER_HOST_MODE=hostname
       - MODE=standalone
diff --git a/dubbo-samples-nacos/dubbo-samples-nacos-registry/case-configuration.yml b/dubbo-samples-nacos/dubbo-samples-nacos-registry/case-configuration.yml
index 6a1b00a..7f2715b 100644
--- a/dubbo-samples-nacos/dubbo-samples-nacos-registry/case-configuration.yml
+++ b/dubbo-samples-nacos/dubbo-samples-nacos-registry/case-configuration.yml
@@ -16,7 +16,7 @@
 
 services:
   nacos:
-    image: nacos/nacos-server:1.4.0
+    image: nacos/nacos-server:2.0.0
     environment:
       - PREFER_HOST_MODE=hostname
       - MODE=standalone
diff --git a/dubbo-samples-nacos/dubbo-samples-nacos-tagrouter/case-configuration.yml b/dubbo-samples-nacos/dubbo-samples-nacos-tagrouter/case-configuration.yml
index 0f6c428..cc9b0d3 100644
--- a/dubbo-samples-nacos/dubbo-samples-nacos-tagrouter/case-configuration.yml
+++ b/dubbo-samples-nacos/dubbo-samples-nacos-tagrouter/case-configuration.yml
@@ -16,7 +16,7 @@
 
 services:
   nacos:
-    image: nacos/nacos-server:1.4.0
+    image: nacos/nacos-server:2.0.0
     environment:
       - PREFER_HOST_MODE=hostname
       - MODE=standalone