Require python 3.10 and remove cylc-uiserver as a dependency

[ceblanton]

Describe your changes

Python 3.9 is too old (not receiving security updates) and probably causes fre analysis install issues.

Hand testing showed cylc-uiserver was causing the solver to always use 3.9.

Issue ticket number and link (if applicable)

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

[ceblanton]

Woohoo! Ian I can't believe you practically eyeballed both problems successfully here. Pinning python to 3.10 fixed the sql build problem, and pip installing defusedxml resolved the genbadge problem.

[ilaflott]

So happy we just needed defusedxml in addition to genbadge, thanks for giving that approach a shot.

Also, thrilled to be moving beyond 3.9. Cheers!