Prepare release v277

[heroku-linguist]

Commits since the last release:

• Improve metrics for builds that fail (Improve metrics for builds that fail #1746)
• Link to changelog from runtime.txt deprecation message (Link to changelog from runtime.txt deprecation message #1747)
• Improve Python download/installation (Improve Python download/installation #1749)

For the full diff, see the compare view:
v276...main

[edmorley]

https://github.com/heroku/heroku-buildpack-python/releases/tag/v277

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

- Improved the warning message shown when the requested Python version is not the latest patch version. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Improved the error message shown when the requested Python patch version isn't available. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Improved the error message shown if there was a networking or server related error downloading Python. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Adjusted the curl options used when downloading Python to set a maximum download time of 120s to prevent hanging builds in the case of network issues. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Refactored the Python download step to avoid an unnecessary version check `HEAD` request to S3 prior to downloading Python or reusing a cached install. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Updated the `runtime.txt` deprecation warning to include a link to the deprecation changelog post. ([#1747](https://github.com/heroku/heroku-buildpack-python/pull/1747))
- Improved buildpack metrics for Python version selection. ([#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))
- Improved buildpack metrics for builds that fail. ([#1746](https://github.com/heroku/heroku-buildpack-python/pull/1746) and [#1749](https://github.com/heroku/heroku-buildpack-python/pull/1749))

Deploy as v277 [y/n]? y

Creating GitHub release...
https://github.com/heroku/heroku-buildpack-python/releases/tag/v277

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 277     2025-02-17T18:19:16.897Z published