ci(backport): fix backport PR not running workflow [Backport #2601 to 4.x] (#2602)

### This is an automated backport of #2601 to branch `4.x`.

> [!CAUTION]
> **Do not modify this pull request.**

## 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
- [x] CI

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

Co-authored-by: Djordy Koert <djordy.koert@gmail.com>

Author: nelmioapidocbundle-backport[bot]

.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}`.