chore: Fixes plugin scm link (#615)

Without this, the Jenkins plugin module inherits from this property, adding its name to the URL.

This create a problem in plugins.jenkins.io/pipeline-maven as the data is coming from the Update Center.

Author: alecharp

pom.xml

@@ -76,7 +76,7 @@
     <module>jenkins-plugin</module>
   </modules>
 
-  <scm>
+  <scm child.scm.connection.inherit.append.path="false" child.scm.developerConnection.inherit.append.path="false" child.scm.url.inherit.append.path="false">
     <connection>scm:git:https://github.com/jenkinsci/pipeline-maven-plugin.git</connection>
     <developerConnection>scm:git:[email protected]:jenkinsci/pipeline-maven-plugin.git</developerConnection>
     <tag>${scmTag}</tag>