chore github-actions(deps): bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/create-github-app-token](https://github.com/actions/create-github-app-token) and [actions/checkout](https://github.com/actions/checkout).


Updates `actions/create-github-app-token` from 1 to 3
- [Release notes](https://github.com/actions/create-github-app-token/releases)
- [Commits](actions/create-github-app-token@v1...v3)

Updates `actions/checkout` from 4 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/create-github-app-token
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/backport.yml

@@ -25,12 +25,12 @@ jobs:
         startsWith(github.event.comment.body, '/cherry-pick')
       )
     steps:
-      - uses: actions/create-github-app-token@v1
+      - uses: actions/create-github-app-token@v3
         id: app-token
         with:
           app-id: ${{ vars.CI_APP_ID }}
           private-key: ${{ secrets.CI_APP_KEY }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Create backport pull requests
         uses: korthout/backport-action@v4
         with: