Unable to push branch

Hi!
I'm currently trying to implement your workflow in https://github.com/voxpupuli/vox-pupuli-tasks/pull/479

from the workflow config:

  github-action-updater:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
      with:
        token: ${{ secrets.SAADMK11_GITHUB_ACTIONS_VERSION_UPDATER_VPT }}
    - name: GitHub Actions Version Updater
      uses: saadmk11/github-actions-version-updater@v0.5.6
      with:
        token: ${{ secrets.SAADMK11_GITHUB_ACTIONS_VERSION_UPDATER_VPT }}

This fails with:

Create New Branch
  error: pathspec 'refs/pull/479/merge' did not match any file(s) known to git
  Switched to a new branch 'gh-actions-update-1655896430'
  [gh-actions-update-1655896430 7cbc18e] Update GitHub Action Versions
   3 files changed, 14 insertions(+), 14 deletions(-)
  To https://github.com/voxpupuli/vox-pupuli-tasks
   ! [remote rejected] gh-actions-update-1655896430 -> gh-actions-update-1655896430 (shallow update not allowed)
  error: failed to push some refs to 'https://github.com/voxpupuli/vox-pupuli-tasks'
Create Pull Request
  Warning: Could not create a pull request on voxpupuli/vox-pupuli-tasks, status code: [422]

and a couple of questions:

• Does the token for actions/checkout@v2 actually needs the workflow scope?
• The action is marked as successful, even when the push failed. I think that should be changed?