Release prep v1.6.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit 0f74595857cdbade37d9674c22fbf388c9f0eb96. Please verify before merging:

• [ ] last nightly run is green
• [ ] Changelog is readable and has no unlabeled pull requests
• [ ] Ensure the changelog version and metadata version match