Maintenance cleanup

[blink1073]

• Fix min version test by increasing min pytest dep
• Use mdformat instead of prettier and add pyproject validation
• Use releaser v2
• Clean up mypy

[codecov-commenter]

Codecov Report

Base: 81.32% // Head: 81.32% // No change to project coverage 👍

Coverage data is based on head (1fb18a4) compared to base (b68c0f0).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   81.32%   81.32%           
=======================================
  Files           7        7           
  Lines         241      241           
  Branches       25       25           
=======================================
  Hits          196      196           
  Misses         34       34           
  Partials       11       11           

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