Prepare release v260

[heroku-linguist]

Commits since the last release:

• Add support for Python 3.13 (Add support for Python 3.13 #1661)

For the full diff, see the compare view:
v259...main

[edmorley]

$ make publish
Deploy as version: v260 [y/n]? y

Tagging commit a2cf258ef18ce0ffce2b9a8f8ae33d91c645ddee with v260... 
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
To https://github.com/heroku/heroku-buildpack-python
 * [new tag]         v260 -> v260

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 260     2024-10-10T20:20:26.853Z published