Bump dependency edu.hm.hafner:codingstyle-pom to v6.13.0

Author: renovate[bot]

pom.xml

@@ -7,7 +7,7 @@
   <parent>
     <groupId>edu.hm.hafner</groupId>
     <artifactId>codingstyle-pom</artifactId>
-    <version>6.12.0</version>
+    <version>6.13.0</version>
     <relativePath/>
   </parent>