Use https: for scm URL (#98)

I am trying to add the `gitea` plugin to the plugin BOM. In order to do that, we need to modify the `scm.connection` to start with `scm:git:https` instead of just `https`.

pom.xml

@@ -23,7 +23,7 @@
     </licenses>
 
     <scm>
-        <connection>https://github.com/jenkinsci/${project.artifactId}-plugin.git</connection>
+        <connection>scm:git:https://github.com/jenkinsci/${project.artifactId}-plugin.git</connection>
         <developerConnection>scm:git:[email protected]:jenkinsci/${project.artifactId}-plugin.git</developerConnection>
         <url>https://github.com/jenkinsci/${project.artifactId}-plugin</url>
         <tag>${scmTag}</tag>