build(deps): 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@bd410d3...be567af)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/backport.yml

@@ -27,7 +27,7 @@ jobs:
           # before creating a pull request
           persist-credentials: true
       - name: Create backport PRs
-        uses: korthout/backport-action@bd410d37cdcae80be6d969823ff5a225fe5c833f # v3.0.2
+        uses: korthout/backport-action@be567af183754f6a5d831ae90f648954763f17f5 # v3.1.0
         with:
           # Config README: https://github.com/korthout/backport-action#backport-action
           branch_name: backport/${pull_number}-to-${target_branch}