Bump korthout/backport-action from 2.1.1 to 2.3.0

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 2.1.1 to 2.3.0.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](korthout/backport-action@08bafb3...addffea)

---
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

@@ -20,7 +20,7 @@ jobs:
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: Create backport PRs
-        uses: korthout/backport-action@08bafb375e6e9a9a2b53a744b987e5d81a133191 # v2.1.1
+        uses: korthout/backport-action@addffea45a2f0b5682f1d5ba0506f45bc18bf174 # v2.3.0
         # xref: https://github.com/korthout/backport-action#inputs
         with:
           # Use token to allow workflows to be triggered for the created PR