Merge pull request syslog-ng#4999 from syslog-ng/grammarcheck_gh_token

actions: comment-cfg-grammar-changes.yml use github token as GH_TOKEN

Author: folti

.github/workflows/comment-cfg-grammar-changes.yml

@@ -14,6 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
         # The download-artifact action cannot download artifacts from other workflows.
         # Copied from https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_run