Prepare release v280

[heroku-linguist]

Commits since the last release:

• Bump the ruby-dependencies group across 1 directory with 2 updates (Bump the ruby-dependencies group across 1 directory with 2 updates #1770)
• Bump rubocop from 1.74.0 to 1.75.1 in the ruby-dependencies group (Bump rubocop from 1.74.0 to 1.75.1 in the ruby-dependencies group #1771)
• Update repo metadata (Update repo metadata #1773)
• Bump pip from 24.3.1 to 25.0.1 (Bump pip from 24.3.1 to 25.0.1 #1759)
• Bump poetry from 2.1.1 to 2.1.2 (Bump poetry from 2.1.1 to 2.1.2 #1772)

For the full diff, see the compare view:
v279...main

[edmorley]

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

- Updated pip from 24.3.1 to 25.0.1. ([#1759](https://github.com/heroku/heroku-buildpack-python/pull/1759))
- Updated Poetry from 2.1.1 to 2.1.2. ([#1772](https://github.com/heroku/heroku-buildpack-python/pull/1772))

Deploy as v280 [y/n]? y

Creating GitHub release...
https://github.com/heroku/heroku-buildpack-python/releases/tag/v280

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 280     2025-04-08T10:11:47.057Z published