Fix/python versions, type checks

[MarcusRisanger]

• Type checks in tox for all versions
• Less restrictive python version requirement

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (b2da499) to head (dc33cb4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #35   +/-   ##
=======================================
  Coverage   91.13%   91.13%           
=======================================
  Files          17       17           
  Lines         869      869           
=======================================
  Hits          792      792           
  Misses         77       77           

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