[gitflow-maven-plugin] Update versions for release 2.1.0

Author: stefanseifert

parent_toplevel/pom.xml

@@ -31,7 +31,7 @@
 
   <groupId>io.wcm.devops</groupId>
   <artifactId>io.wcm.devops.parent_toplevel</artifactId>
-  <version>2.1.0-SNAPSHOT</version>
+  <version>2.1.0</version>
   <packaging>pom</packaging>
 
   <name>Toplevel Parent</name>