Update to Sling Parent 23

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1687500 13f79535-47bb-0310-9956-ffa450edef68

pom.xml

diff --git a/pom.xml b/pom.xml
index db0f339..dc40c86 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>22</version>
+        <version>23</version>
         <relativePath/>
     </parent>