Switch to using uv-tox

[RobotSail]

The current setup uses regular pip for tox environments and is very slow as a result.
uv-tox is an excellent solution that would drastically speed up the development workflow.

[github-actions]

This issue has been automatically marked as stale because it has not had activity within 90 days. It will be automatically closed if no further activity occurs within 30 days.

[RobotSail]

not stale