Prepare release v252

[heroku-linguist]

Commits since the last release:

• Enable rspec-retry in CI (Enable rspec-retry in CI #1594)
• Remove unnecessary pipenv-to-pip script (Remove unnecessary pipenv-to-pip script #1593)
• Misc bash script refactoring (Misc bash script refactoring #1595)
• Improve shellcheck coverage (Improve shellcheck coverage #1596)
• Implement bin/report (Implement bin/report #1597)

For the full diff, see the compare view:
v251...main

[edmorley]

$ make publish
Deploy as version: v252 [y/n]? y

Tagging commit 68db0576d75747a2be71877b70c6022c91798613 with v252... 
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0
To https://github.com/heroku/heroku-buildpack-python
 * [new tag]         v252 -> v252

Publishing to the buildpack registry...
Two-factor code: ********************************************
Publishing buildpack heroku/python... done
Publishing buildpack was successful

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 252     2024-06-17T13:02:27.538Z published