Bump version to v0.15.1.

CHANGELOG.md

@@ -10,7 +10,7 @@ The format is based on [Keep a Changelog], and this project adheres to
 [keep a changelog]: https://keepachangelog.com/en/1.0.0/
 [semantic versioning]: https://semver.org/spec/v2.0.0.html
 
-## [Unreleased]
+## [0.15.1] - 2024-07-16
 
 ### Added
 
@@ -380,6 +380,7 @@ guide][0.11.0 migration guide] for detailed instructions.
 [0.13.12]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.12
 [0.14.0]: https://github.com/dogmatiq/testkit/releases/tag/v0.14.0
 [0.15.0]: https://github.com/dogmatiq/testkit/releases/tag/v0.15.0
+[0.15.1]: https://github.com/dogmatiq/testkit/releases/tag/v0.15.1
 
 <!-- version template
 ## [0.0.1] - YYYY-MM-DD