chore(deps): bump zeebe-io/backport-action from 2.3.0 to 2.4.0

Bumps [zeebe-io/backport-action](https://github.com/zeebe-io/backport-action) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/zeebe-io/backport-action/releases)
- [Commits](korthout/backport-action@v2.3.0...v2.4.0)

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

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

.github/workflows/backport.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Create backport PRs
-        uses: zeebe-io/backport-action@v2.3.0
+        uses: zeebe-io/backport-action@v2.4.0
         with:
           # Required
           # Token to authenticate requests to GitHub