Prepare release v6.5.0

## heroku/python

### Changed

- Updated pip from 26.0.1 to 26.1.1. ([#563](#563))
- Updated Poetry from 2.3.4 to 2.4.0. ([#564](#564))
- Updated uv from 0.11.6 to 0.11.11. ([#562](#562))
- The forbidden env vars check now also rejects `POETRY_VIRTUALENVS_IN_PROJECT`. ([#566](#566))
- Updated the wording of the message shown when buildpack detection fails to also mention `uv.lock`. ([#567](#567))

Author: heroku-linguist[bot]

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [6.5.0] - 2026-05-07
+
 ### Changed
 
 - Updated pip from 26.0.1 to 26.1.1. ([#563](https://github.com/heroku/buildpacks-python/pull/563))
@@ -644,7 +646,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation. ([#3](https://github.com/heroku/buildpacks-python/pull/3))
 
-[unreleased]: https://github.com/heroku/buildpacks-python/compare/v6.4.1...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-python/compare/v6.5.0...HEAD
+[6.5.0]: https://github.com/heroku/buildpacks-python/compare/v6.4.1...v6.5.0
 [6.4.1]: https://github.com/heroku/buildpacks-python/compare/v6.4.0...v6.4.1
 [6.4.0]: https://github.com/heroku/buildpacks-python/compare/v6.3.0...v6.4.0
 [6.3.0]: https://github.com/heroku/buildpacks-python/compare/v6.2.0...v6.3.0

buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/python"
-version = "6.4.1"
+version = "6.5.0"
 name = "Heroku Python"
 homepage = "https://github.com/heroku/buildpacks-python"
 description = "Heroku's buildpack for Python applications."