chore: changelog v0.12.0

Author: tlambert03

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [v0.12.0](https://github.com/pyapp-kit/psygnal/tree/v0.12.0) (2025-05-05)
+
+[Full Changelog](https://github.com/pyapp-kit/psygnal/compare/v0.11.2...v0.12.0)
+
+**Implemented enhancements:**
+
+- feat: add testing utilities [\#368](https://github.com/pyapp-kit/psygnal/pull/368) ([tlambert03](https://github.com/tlambert03))
+
+**Merged pull requests:**
+
+- ci\(pre-commit.ci\): autoupdate [\#369](https://github.com/pyapp-kit/psygnal/pull/369) ([pre-commit-ci[bot]](https://github.com/apps/pre-commit-ci))
+
 ## [v0.11.2](https://github.com/pyapp-kit/psygnal/tree/v0.11.2) (2025-04-30)
 
 [Full Changelog](https://github.com/pyapp-kit/psygnal/compare/v0.12.0...v0.11.2)