Prepare release v7.0.0 (#410)

## heroku/ruby

### Changed

- Default Ruby version is now 3.3.7 and default bundler version is now 2.5.23 ([#408](#408))

### Fixed

- The `docker run` command no longer requires an entrypoint when using default processes provided by `heroku/ruby` directly (and not the `heroku/procfile` buildpack) ([#404](#404))

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

Author: heroku-linguist[bot]

buildpacks/ruby/CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [7.0.0] - 2025-03-19
+
 ### Changed
 
 - Default Ruby version is now 3.3.7 and default bundler version is now 2.5.23 ([#408](https://github.com/heroku/buildpacks-ruby/pull/408))
@@ -118,7 +120,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Initial version of Ruby buildpack in Rust (https://github.com/heroku/buildpacks-ruby/pull/93)
 - Version 2.0.0 for the first release is not a typo. There was an issue in pack where a builder with the same name and version number would reuse artifacts left on image from [prior runs which caused issues](https://github.com/buildpacks/pack/issues/1322#issuecomment-1038241038). There were prior releases of `heroku/ruby` CNB from different sources that triggered this problem. To ensure no one would encounter that issue we developed and released using a version we know has not been used before. Version 2.0 was the first major version without a prior release of `heroku/ruby` CNB from any source.
 
-[unreleased]: https://github.com/heroku/buildpacks-ruby/compare/v6.0.0...HEAD
+[unreleased]: https://github.com/heroku/buildpacks-ruby/compare/v7.0.0...HEAD
+[7.0.0]: https://github.com/heroku/buildpacks-ruby/compare/v6.0.0...v7.0.0
 [6.0.0]: https://github.com/heroku/buildpacks-ruby/compare/v5.1.0...v6.0.0
 [5.1.0]: https://github.com/heroku/buildpacks-ruby/compare/v5.0.1...v5.1.0
 [5.0.1]: https://github.com/heroku/buildpacks-ruby/compare/v5.0.0...v5.0.1

buildpacks/ruby/buildpack.toml

@@ -2,7 +2,7 @@ api = "0.10"
 
 [buildpack]
 id = "heroku/ruby"
-version = "6.0.0"
+version = "7.0.0"
 name = "Heroku Ruby"
 homepage = "https://github.com/heroku/buildpacks-ruby"
 description = "Heroku's buildpack for Ruby applications."