Update changelog

Author: droserasprout

CHANGELOG.md

@@ -5,11 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog],
 and this project adheres to [Semantic Versioning].
 
-## [Unreleased]
+## [6.1.1] - 2022-09-01
 
 ### Fixed
 
-- ci: Lock Pydantic to 1.9.2 to avoid breaking changes in 1.10.0
+- ci: Lock Pydantic to 1.9.2 to avoid breaking changes in dataclasses.
 
 ## [6.1.0] - 2022-08-30