Prepare release v0.4.0

## heroku/go

- Added go1.21.11 (linux-amd64), go1.21.11 (linux-arm64).
- Added go1.22.4 (linux-arm64), go1.22.4 (linux-amd64).
### Changed

- The build cache is now invalidated when the target distribution changes. ([#267](#267))
- The build cache is no longer invalidated on minor go version changes. ([#267](#267))

buildpacks/go/CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.0] - 2024-06-04
+
 - Added go1.21.11 (linux-amd64), go1.21.11 (linux-arm64).
 - Added go1.22.4 (linux-arm64), go1.22.4 (linux-amd64).
 ### Changed
@@ -163,7 +165,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation using libcnb.rs. ([#1](https://github.com/heroku/buildpacks-go/pull/1))
 
-[unreleased]: https://github.com/heroku/buildpacks-go/compare/v0.3.1...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-go/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/heroku/buildpacks-go/compare/v0.3.1...v0.4.0
 [0.3.1]: https://github.com/heroku/buildpacks-go/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/heroku/buildpacks-go/compare/v0.2.1...v0.3.0
 [0.2.1]: https://github.com/heroku/buildpacks-go/compare/v0.2.0...v0.2.1

buildpacks/go/buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/go"
-version = "0.3.1"
+version = "0.4.0"
 name = "Heroku Go"
 homepage = "https://github.com/heroku/buildpacks-go"
 description = "Heroku's buildpack for Go applications."