.github: Bump korthout/backport-action from 4.3.0 to 4.4.0

Bumps [korthout/backport-action](https://github.com/korthout/backport-action) from 4.3.0 to 4.4.0.
- [Release notes](https://github.com/korthout/backport-action/releases)
- [Commits](3c06f323a5...ad30f01dbe)

---
updated-dependencies:
- dependency-name: korthout/backport-action
  dependency-version: 4.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/backport.yml

@@ -49,7 +49,7 @@ jobs:
 
       - name: Create backport PRs
         id: backport
-        uses: korthout/backport-action@3c06f323a58619da1e8522229ebc8d5de2633e46 # v4.3.0
+        uses: korthout/backport-action@ad30f01dbe543be4a24431001c38f3617af8c745 # v4.4.0
         with:
           # Config README: https://github.com/korthout/backport-action#backport-action
           add_author_as_reviewer: true