ci(backport): fix backport PR not running workflow (#2601)

## Description

should fix backport PR's not triggering CI workflow

## What type of PR is this? (check all applicable)
- [ ] Bug Fix
- [ ] Feature
- [ ] Refactor
- [ ] Deprecation
- [ ] Breaking Change
- [ ] Documentation Update
- [ ] CI

## Checklist
- [ ] I have made corresponding changes to the documentation (`docs/`)
- [ ] I have made corresponding changes to the changelog
(`CHANGELOG.md`)

Author: DjordyKoert

.github/workflows/backport.yml

@@ -25,10 +25,17 @@ jobs:
         && github.event.pull_request.merged
       )
     steps:
+      - uses: actions/create-github-app-token@v2
+        id: generate-token
+        with:
+          app-id: ${{ secrets.BACKPORT_APP_ID }}
+          private-key: ${{ secrets.BACKPORT_APP_PRIVATE_KEY }}
       - uses: actions/checkout@v4
       - name: Create backport pull requests
         uses: korthout/backport-action@v3
         with:
+          # Token to authenticate requests to GitHub, ensures that created PRs run CI
+          github_token: ${{ steps.generate-token.outputs.token }}
           branch_name: backport-#${pull_number}-to-${target_branch}
           pull_description: |
             ### This is an automated backport of #${pull_number} to branch `${target_branch}`.