dpkg: Update to 1.21.22

[TheRealKeto]

For whatever reason, dpkg maintainers decided to remove old versions of dpkg. Updating dpkg should prevent people from having issues regarding missing tarballs, and users will be obtaining the latest version.

Checklist

• [x] Have you made sure there aren't any other open Pull Requests for the same update/change?
• [ ] This Pull Request doesn't contain any package additions; it's a small change (e.g README change)
• [x] Have you confirmed this builds & works as intended on an iOS device (if applicable)?
• [x] Have you confirmed this builds & works as intended on a macOS device (if applicable)?

[TheRealKeto]

Closed as completed by 5bf41f7 (which was meant to say dpkg, not diffutils)