Prepare release v249

[heroku-linguist[bot]]

Commits since the last release:

• Update changelog entry for #1560 (#1562)
• Cleanup binary build workflows/scripts (#1564)
• Exclude LD_LIBRARY_PATH and PYTHONHOME when invoking subprocesses (#1565)
• Adjust compiler options used to build Python (#1566)
• Replace the runtime-fixer Python script with Bash (#1568)
• Fix the "security update available" version check (#1569)
• Improve the EOL Python error messaging (#1570)
• Change compression format and S3 URL for Python runtime archives (#1567)
• Update Python and dependency versions in test fixtures (#1571)

For the full diff, see the compare view: https://github.com/heroku/heroku-buildpack-python/compare/v248...main

[edmorley]

$ make publish
Deploy as version: v249 [y/n]? y

Tagging commit 96e0ced64cf0f10fadac05f594e340448fac4d1c with v249... 
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0
To https://github.com/heroku/heroku-buildpack-python
 * [new tag]         v249 -> v249

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

 Version Released At              Status    
 ─────── ──────────────────────── ───────── 
 249     2024-04-18T16:20:12.326Z published