Release prep v3.16.1

[cathal41]

Automated release-prep through pdk-templates from commit 14ccfb337cce7f55581d67a7abd51e981f9b7725. Please verify before merging:

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