Find a way to get back on main for `heroku_hatchet`

[schneems]

I'm trying to upgrade everyone's heroku_hatchet gem to the latest due to heroku/hatchet#210. But can't because this repo is using a branch:

heroku-buildpack-php/Gemfile

Line 5 in dd69b2a

gem 'heroku_hatchet', git: 'https://github.com/heroku/hatchet.git', branch: 'timeouts-etc'

Possible short term workaround would be to try to rebase that branch against main. For background context this branch exists because David was working towards doing something with timeouts heroku/hatchet#158, but that never panned out.

Longer term: We should find a way to get this repo back on main so we're not working on a long lived branch.

GUS-W-19028784