Prepare release v282

[heroku-linguist]

Commits since the last release:

• Remove support for Heroku-20 (Remove support for Heroku-20 #1778)
• Bump the ruby-dependencies group with 3 updates (Bump the ruby-dependencies group with 3 updates #1781)

For the full diff, see the compare view:
v281...main

[edmorley]

$ make publish
Checking environment...
Checking buildpack versions in sync...
Extracting changelog entry for this release...

- Removed support for Heroku-20. ([#1778](https://github.com/heroku/heroku-buildpack-python/pull/1778))

Deploy as v282 [y/n]? y

Creating GitHub release...
https://github.com/heroku/heroku-buildpack-python/releases/tag/v282

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 282     2025-05-02T10:34:26.025Z published