.github/workflows: remove unnecessary permissions for leaving PR comments

https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#permissions

Signed-off-by: Patrick Donnelly <[email protected]>

Author: batrick

.github/workflows/redmine-upkeep.yml

@@ -39,9 +39,6 @@ jobs:
     runs-on: ubuntu-latest
     # This condition ensures the job only runs in the main ceph/ceph repository and only on the specified branches.
     if: github.repository == 'ceph/ceph' && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/feature/redmine-upkeep')
-    permissions:
-      # To allow writing comments on PRs:
-      issues: write
     steps:
       - name: Checkout main branch for pull_request_target
         if: github.event_name == 'pull_request_target'