Prepare release v1.0.0 (#374)

## heroku/dotnet

### Added

- Support for .NET SDK versions: 8.0.123, 8.0.417, 9.0.113, 9.0.309, 10.0.102.

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]
 
+## [1.0.0] - 2026-01-13
+
 ### Added
 
 - Support for .NET SDK versions: 8.0.123, 8.0.417, 9.0.113, 9.0.309, 10.0.102.
@@ -361,7 +363,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial implementation.
 
-[unreleased]: https://github.com/heroku/buildpacks-dotnet/compare/v0.15.0...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-dotnet/compare/v1.0.0...HEAD
+[1.0.0]: https://github.com/heroku/buildpacks-dotnet/compare/v0.15.0...v1.0.0
 [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

buildpacks/dotnet/buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/dotnet"
-version = "0.15.0"
+version = "1.0.0"
 name = "Heroku .NET"
 homepage = "https://github.com/heroku/buildpacks-dotnet"
 description = "Heroku's buildpack for .NET applications."