Release prep v8.1.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit dc991dc5864a9aa5b1b9f8b945258e6bd6c00d58. 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

[h0tw1r3]

@bastelfreak I'm not in puppetlabs-puppetdb codeowners, should probably be at this point.