Update for release 1.2.1 (#255)

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## Types of changes
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- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)

## Checklist:
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- [ ] I have updated the [changelog](../CHANGELOG.md) accordingly.
- [ ] I have added tests to cover my changes.

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to the sdc11073 module will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.2.1] - 2023-09-05
 
 ### Fixed