Prepare release v256

[heroku-linguist]

Commits since the last release:

• Bump the ruby-dependencies group with 2 updates (Bump the ruby-dependencies group with 2 updates #1627)
• Bump wheel from 0.43.0 to 0.44.0 (Bump wheel from 0.43.0 to 0.44.0 #1629)
• Add setuptools to the Dependabot ignore list (Add setuptools to the Dependabot ignore list #1631)
• Bump rubocop from 1.65.1 to 1.66.0 in the ruby-dependencies group (Bump rubocop from 1.65.1 to 1.66.0 in the ruby-dependencies group #1628)
• Add support for Python 3.8.20, 3.9.20, 3.10.15, 3.11.10 and 3.12.6 (Add support for Python 3.8.20, 3.9.20, 3.10.15, 3.11.10 and 3.12.6 #1632)

For the full diff, see the compare view:
v255...main

[edmorley]

$ make publish
Deploy as version: v256 [y/n]? y

Tagging commit d13fbbdea7a86471872241f811eaf08787757d44 with v256... 
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0
To https://github.com/heroku/heroku-buildpack-python
 * [new tag]         v256 -> v256

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 256     2024-09-07T19:56:05.879Z published