ci: bump korthout/backport-action

Bumps the github-actions group with 1 update in the / directory: [korthout/backport-action](https://github.com/korthout/backport-action).


Updates `korthout/backport-action` from 4.5.2 to 4.6.0
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](https://github.com/korthout/backport-action/compare/66065406958f46e82238fd59546f5a99e69e22aa...2e830a1d0b8269505846ddd407a70876913ad1f8)

---
updated-dependencies:
- dependency-name: korthout/backport-action
  dependency-version: 4.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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

.github/workflows/backport.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Create backport PR
         id: backport
-        uses: korthout/backport-action@66065406958f46e82238fd59546f5a99e69e22aa # v4.5.2
+        uses: korthout/backport-action@2e830a1d0b8269505846ddd407a70876913ad1f8 # v4.6.0
         with:
           pull_title: "backport: ${pull_title}"
           label_pattern: "^ci:backport ([^ ]+)$"