"Error: Could not update the JSON file: Could not update file: Changes must be made through a pull request."

[laurent22]

URL to the linked Repository or Organization

https://github.com/laurent22/joplin/pull/7755

Steps to reproduce the problem

There's not specific steps, but for some reason one of the signatures is not being processed:

https://github.com/laurent22/joplin/actions/runs/4155636396

Run contributor-assistant/[email protected]
  with:
    path-to-signatures: readme/cla_signatures.json
    path-to-document: https://github.com/laurent22/joplin/blob/dev/readme/cla.md
    branch: dev
    allowlist: joplinbot,renovate[bot]
    use-dco-flag: false
    lock-pullrequest-aftermerge: true
  env:
    GITHUB_TOKEN: ***
    PERSONAL_ACCESS_TOKEN: ***
CLA Assistant GitHub Action bot has started the process
Error: Could not update the JSON file: Could not update file: Changes must be made through a pull request.

I don't quite understand what that means - the pull request has been signed here like all other pull requests, but for some reason this one in particular does not work. I've also retried the job without success.

Any idea what might be the issue?