Switch to parent pom 26

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1722720 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index ae22a94..90ef6b8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>25</version>
+        <version>26</version>
     </parent>
 
     <artifactId>org.apache.sling.tail</artifactId>