Bump korthout/backport-action from 3.0.2 to 3.1.0

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](korthout/backport-action@v3.0.2...v3.1.0)

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

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

.github/workflows/backport.yaml

@@ -33,7 +33,7 @@ jobs:
           token: ${{ secrets.GH_BACKPORT_TOKEN }}
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Create backport PRs
-        uses: korthout/backport-action@v3.0.2
+        uses: korthout/backport-action@v3.1.0
         with:
           # Inputs documented here: https://github.com/korthout/backport-action?tab=readme-ov-file#inputs
           github_token: ${{ secrets.GH_BACKPORT_TOKEN }}