Pin Pint to a specific version?

[retlehs]

Since we don't include a composer.lock file on this project and Laravel Pint is currently not pinned to a specific version, updates from Pint have resulted CI failures out of the blue:

https://github.com/roots/acorn/actions/runs/7465906223/job/20743042938?pr=329

If Pint continues to introduce changes like this in minor versions, then we might want to just pin the version. Applying the new formatting requirements to the codebase could potentially introduce conflicts with any open PRs.