Prepare v8.1.2 release (#293) (#296)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kkozik-amplify

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## \[Unreleased\]
 
+- Nothing yet.
+
+## \[8.1.2\] - 2026-04-10
+
 ### Fixed
 
 - `true`, `false`, and `null` now serialize to native JSON types instead of strings. ([#293](https://github.com/amplify-education/python-hcl2/issues/293))