Prepare release v342

[heroku-linguist]

Commits since the last release:

• Add buildpack support for Heroku-26 (Add buildpack support for Heroku-26 #2073)

For the full diff, see the compare view:
v341...main

[edmorley]

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

- Added support for Heroku-26. ([#2073](https://github.com/heroku/heroku-buildpack-python/pull/2073))

Deploy as v342 [y/n]? y

Creating GitHub release...
https://github.com/heroku/heroku-buildpack-python/releases/tag/v342

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 342     2026-04-09T22:26:58.454Z published