[release] Update parent after release xwiki-rendering-17.4.7

Author: surli

pom.xml

@@ -23,11 +23,11 @@
   <parent>
     <groupId>org.xwiki.commons</groupId>
     <artifactId>xwiki-commons-pom</artifactId>
-    <version>17.4.7</version>
+    <version>17.4.8-SNAPSHOT</version>
     <!-- Note: Do not modify the <relativePath> tag here as this can cause issues. See the pom.xml for xwiki-platform
          for more details. By using an empty value we force Maven to resolve the parent from the Maven repositories,
          see http://maven.apache.org/ref/3.2.3/maven-model/maven.html#class_parent -->
-    <relativePath />
+    <relativePath/>
   </parent>
   <groupId>org.xwiki.rendering</groupId>
   <artifactId>xwiki-rendering</artifactId>