fix: Attempt to unblock luarocks-release.

[kylechui]

Using a GitHub private access token in order to allow other actions to run on top of the release-please action, since otherwise they are blocked to avoid recursive actions.

You will want to configure a GitHub Actions secret with a Personal Access Token
if you want GitHub Actions CI checks to run on Release Please PRs.

Ref: https://github.com/googleapis/release-please-action?tab=readme-ov-file#other-actions-on-release-please-prs

[kylechui]

This works if in the PAT you grant read/write access to contents as well as pull requests. When I check the status of my PAT it says that it has 3 sets of permissions:

• Contents: Read and write
• Metadata: Read-only
  • Note that this one is mandatory
• Pull Requests: Read and write