Merge pull request #1523 from christoph-jerolimov/gitlab/backstage-1.42-update

feat(gitlab): update to backstage 1.42.5

Author: davidfestal

workspaces/gitlab/backstage.json

@@ -1 +1 @@
-{"repo":"https://github.com/immobiliare/backstage-plugin-gitlab","repo-ref":"v6.12.1","repo-flat":"true","repo-backstage-version":"1.39.1"}
+{"repo":"https://github.com/immobiliare/backstage-plugin-gitlab","repo-ref":"v6.13.0","repo-flat":"true","repo-backstage-version":"1.42.5"}