Use current ref when tagging in tag-git-repos.groovy

Rely to git fetch && git checkout FETCH_HEAD to choose ref for tagging.

Change-Id: I735cfa8e3d1fc5fa2e5055bb29fb977d0cca55c3
See: https://mirantis.jira.com/browse/PROD-23781
diff --git a/tag-git-repos.groovy b/tag-git-repos.groovy
index 8e3a918..68fcdcd 100644
--- a/tag-git-repos.groovy
+++ b/tag-git-repos.groovy
@@ -32,7 +32,7 @@
     ],
   ])
   dir(repoName) {
-    sh "git tag -f -a ${tag} ${ref} -m \"Release of mcp version ${tag}\""
+    sh "git tag -f -a ${tag} -m \"Release of mcp version ${tag}\""
     sshagent([credentials]) {
       sh "git push -f origin ${tag}:refs/tags/${tag}"
     }