CI: need to fetch master branch

.gitlab-ci.yml

@@ -37,8 +37,9 @@ check-version:
     - fsl-ci
     - docker
   script:
-    - thisver=$(  cat manifest_rules/__init__.py             | grep __version__ | cut -d " " -f 3 | tr -d "'")
-    - masterver=$(git show master:manifest_rules/__init__.py | grep __version__ | cut -d " " -f 3 | tr -d "'")
+    - git fetch origin master
+    - thisver=$(  cat manifest_rules/__init__.py                    | grep __version__ | cut -d " " -f 3 | tr -d "'")
+    - masterver=$(git show origin/master:manifest_rules/__init__.py | grep __version__ | cut -d " " -f 3 | tr -d "'")
     - |
       if [ "$thisver" = "$masterver" ]; then
         echo "Version has not been updated!"