Prepare release v0.15.0 (#370)

## heroku/dotnet

### Fixed

- Launch process detection now skips projects whose executables don't exist at the expected path. ([#364](#364))

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

Author: heroku-linguist[bot]

buildpacks/dotnet/CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.15.0] - 2026-01-08
+
 ### Fixed
 
 - Launch process detection now skips projects whose executables don't exist at the expected path. ([#364](https://github.com/heroku/buildpacks-dotnet/pull/364))
@@ -355,7 +357,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation.
 
-[unreleased]: https://github.com/heroku/buildpacks-dotnet/compare/v0.14.0...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-dotnet/compare/v0.15.0...HEAD
+[0.15.0]: https://github.com/heroku/buildpacks-dotnet/compare/v0.14.0...v0.15.0
 [0.14.0]: https://github.com/heroku/buildpacks-dotnet/compare/v0.13.0...v0.14.0
 [0.13.0]: https://github.com/heroku/buildpacks-dotnet/compare/v0.12.0...v0.13.0
 [0.12.0]: https://github.com/heroku/buildpacks-dotnet/compare/v0.11.2...v0.12.0

buildpacks/dotnet/buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/dotnet"
-version = "0.14.0"
+version = "0.15.0"
 name = "Heroku .NET"
 homepage = "https://github.com/heroku/buildpacks-dotnet"
 description = "Heroku's buildpack for .NET applications."