fetch the tags before deleting the multidev artifact

.github/workflows/sage-test.yml

@@ -139,5 +139,6 @@ jobs:
         if: always()
         run: |
           cd ~/pantheon-local-copies/wpcm-sage-install-tests
+          git fetch --tags origin
           git tag -d pantheon_build_artifacts-$multidev_name
           git push origin --delete pantheon_build_artifacts-$multidev_name