build(deps): bump korthout/backport-action from 2 to 3

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 2 to 3.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](korthout/backport-action@v2...v3)

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

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

.github/workflows/backport.yml

@@ -17,4 +17,4 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Create backport PRs
-        uses: korthout/backport-action@v2
+        uses: korthout/backport-action@v3