Use specific version of github2lab action

Author: jakob-fritz

.github/workflows/gitlab_ci.yml

@@ -82,7 +82,7 @@ jobs:
           ref: "${{ env.USED_SHA }}"
           persist-credentials: false
       - name: Mirror and wait for Gitlab-CI
-        uses: jakob-fritz/github2lab_action@Iss35_mirror_pr
+        uses: jakob-fritz/github2lab_action@v0.6
         env:
           MODE: 'all' # Either 'mirror', 'get_status', 'get_artifact', or 'all'
           GITLAB_TOKEN: ${{ secrets.GITLAB_SECRET }}