Prepare release v0.20.1 (#305)

## heroku/python

### Fixed

- Fixed colour resetting for build output header, error and warning messages. ([#303](#303) / [heroku/libcnb.rs#890](heroku/libcnb.rs#890))

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

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.1] - 2024-12-13
+
 ### Fixed
 
 - Fixed colour resetting for build output header, error and warning messages. ([#303](https://github.com/heroku/buildpacks-python/pull/303) / [heroku/libcnb.rs#890](https://github.com/heroku/libcnb.rs/pull/890))
@@ -252,7 +254,8 @@ 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/v0.20.0...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-python/compare/v0.20.1...HEAD
+[0.20.1]: https://github.com/heroku/buildpacks-python/compare/v0.20.0...v0.20.1
 [0.20.0]: https://github.com/heroku/buildpacks-python/compare/v0.19.2...v0.20.0
 [0.19.2]: https://github.com/heroku/buildpacks-python/compare/v0.19.1...v0.19.2
 [0.19.1]: https://github.com/heroku/buildpacks-python/compare/v0.19.0...v0.19.1

buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/python"
-version = "0.20.0"
+version = "0.20.1"
 name = "Heroku Python"
 homepage = "https://github.com/heroku/buildpacks-python"
 description = "Heroku's buildpack for Python applications."