OZG-7131 reset branch version

vorgang-manager-server/pom.xml

@@ -58,7 +58,7 @@
 		<nachrichten-manager.version>2.14.1</nachrichten-manager.version>
 		<api-lib.version>0.15.0-SNAPSHOT</api-lib.version>
 		<notification-manager.version>2.13.0-SNAPSHOT</notification-manager.version>
-		<collaboration-manager.version>0.6.0-PR-20-SNAPSHOT</collaboration-manager.version>
+		<collaboration-manager.version>0.6.0-SNAPSHOT</collaboration-manager.version>
 		<archive-manager.version>0.1.0-SNAPSHOT</archive-manager.version>
 		<document-manager.version>1.1.0</document-manager.version>