Bump korthout/backport-action from 1 to 3

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 1 to 3.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](korthout/backport-action@v1...v3)

---
updated-dependencies:
- dependency-name: korthout/backport-action
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/backport.yml

@@ -16,4 +16,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Create backport pull requests
-        uses: korthout/backport-action@v1
+        uses: korthout/backport-action@v3