Release prep v7.3.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit 77a8e289edb489980ec61d361acd0c66a26f15b2. 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