chore(main): release 9.12.0

Author: github-actions[bot]

CHANGELOG.md

@@ -2,6 +2,17 @@
 
 All notable changes to the LaunchDarkly Python SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [9.12.0](https://github.com/launchdarkly/python-server-sdk/compare/9.12.0...9.12.0) (2025-09-30)
+
+
+### Bug Fixes
+
+* Add proper docstring formatting with :param and :return: style ([b7eec96](https://github.com/launchdarkly/python-server-sdk/commit/b7eec9696be7bd03e1198592e13dbc8c17cbb0e0))
+* Add validation format check for SDK key ([133b3db](https://github.com/launchdarkly/python-server-sdk/commit/133b3db811882a17ede887b9fb622815e4d0fd2b))
+* Add validation format check for SDK key ([#351](https://github.com/launchdarkly/python-server-sdk/issues/351)) ([4c8d4ae](https://github.com/launchdarkly/python-server-sdk/commit/4c8d4ae639f0206b79b7cd6e1e76c8b72f93cf55))
+* Correct non-string SDK key validation test ([6b0920b](https://github.com/launchdarkly/python-server-sdk/commit/6b0920bf764fcc4428f25788cf10e7788a2553f3))
+* Update SDK key validation to follow dotnet pattern ([5891f34](https://github.com/launchdarkly/python-server-sdk/commit/5891f344898b14d1751b4234f63cc3fcb6812f2b))
+
 ## [9.12.0](https://github.com/launchdarkly/python-server-sdk/compare/9.11.1...9.12.0) (2025-07-11)