Prepare release v336

[heroku-linguist]

Commits since the last release:

• Switch to AWS' dual-stack S3 URLs (Switch to AWS' dual-stack S3 URLs #2035)
• Work around NLTK v3.9.3 regression (Work around NLTK v3.9.3 regression #2042)
• Bump rubocop from 1.84.0 to 1.85.0 in the ruby-dependencies group (Bump rubocop from 1.84.0 to 1.85.0 in the ruby-dependencies group #2039)
• Bump sigstore/cosign/cosign from v3.0.4 to v3.0.5 in /builds (Bump sigstore/cosign/cosign from v3.0.4 to v3.0.5 in /builds #2040)

For the full diff, see the compare view:
v335...main

[edmorley]

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

- Added a workaround for `nltk.txt` package downloader errors caused by an upstream regression in NLTK v3.9.3. ([#2041](https://github.com/heroku/heroku-buildpack-python/pull/2041))
- Changed the S3 URL used to download Python to use AWS' dual-stack (IPv6 compatible) endpoint. ([#2035](https://github.com/heroku/heroku-buildpack-python/pull/2035))

Deploy as v336 [y/n]? y

Creating GitHub release...
https://github.com/heroku/heroku-buildpack-python/releases/tag/v336

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 336     2026-03-02T17:29:33.136Z published