Prepare release v6.1.0 (#525)

## heroku/python

### Changed

- Updated uv from 0.10.7 to 0.10.9. ([#523](#523))
- Switched to downloading uv from `releases.astral.sh` instead of GitHub releases. ([#524](#524))

Co-authored-by: heroku-linguist[bot] <136119646+heroku-linguist[bot]@users.noreply.github.com>

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]
 
+## [6.1.0] - 2026-03-13
+
 ### Changed
 
 - Updated uv from 0.10.7 to 0.10.9. ([#523](https://github.com/heroku/buildpacks-python/pull/523))
@@ -605,7 +607,8 @@ 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/v6.0.1...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-python/compare/v6.1.0...HEAD
+[6.1.0]: https://github.com/heroku/buildpacks-python/compare/v6.0.1...v6.1.0
 [6.0.1]: https://github.com/heroku/buildpacks-python/compare/v6.0.0...v6.0.1
 [6.0.0]: https://github.com/heroku/buildpacks-python/compare/v5.1.0...v6.0.0
 [5.1.0]: https://github.com/heroku/buildpacks-python/compare/v5.0.0...v5.1.0

buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/python"
-version = "6.0.1"
+version = "6.1.0"
 name = "Heroku Python"
 homepage = "https://github.com/heroku/buildpacks-python"
 description = "Heroku's buildpack for Python applications."