GitHub Actions(deps): Bump sqren/backport-github-action

Bumps [sqren/backport-github-action](https://github.com/sqren/backport-github-action) from 9.3.0 to 9.5.1.
- [Release notes](https://github.com/sqren/backport-github-action/releases)
- [Commits](sorenlouv/backport-github-action@v9.3.0...v9.5.1)

---
updated-dependencies:
- dependency-name: sqren/backport-github-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/backport.yml

@@ -15,7 +15,7 @@ jobs:
       )
     steps:
       - name: Backport Action
-        uses: sqren/backport-github-action@v9.3.0
+        uses: sqren/backport-github-action@v9.5.1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           auto_backport_label_prefix: auto-backport-to-