Release prep v4.3.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit ecd08f3a8507d5b437c00fbf479b80f03a6086b8. 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