Add additional permissions for backport workflow

[cdce8p]

Backporting the release workflow improvements failed. E.g. #10267

 /usr/bin/git push --set-upstream origin backport-10267-to-maintenance/3.3.x To https://github.com/pylint-dev/pylint.git ! [remote rejected] backport-10267-to-maintenance/3.3.x -> backport-10267-to-maintenance/3.3.x (refusing to allow a GitHub App to create or update workflow `.github/workflows/release.yml` without `workflows` permission) error: failed to push some refs to 'https://github.com/pylint-dev/pylint.git' 

https://github.com/pylint-dev/pylint/actions/runs/13748264125/job/38445990683#step:2:32

Judging by the error message, the action needs additional permissions to update workflow files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.86%. Comparing base (42aa204) to head (f46af93).
⚠️ Report is 307 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #10269 +/- ## ======================================= Coverage 95.86% 95.86% ======================================= Files 175 175 Lines 19068 19068 ======================================= Hits 18280 18280 Misses 788 788 

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