chore: Modernize ci/tox/pypi

[adinhodovic]

• chore: Modernize ci/tox/pypi
• ci: Update tox

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (15329ed) 98.24% compared to head (cc97dc3) 95.61%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
- Coverage   98.24%   95.61%   -2.64%     
==========================================
  Files           5        5              
  Lines         114      114              
  Branches        7        8       +1     
==========================================
- Hits          112      109       -3     
- Misses          2        4       +2     
- Partials        0        1       +1     

Flag	Coverage Δ
unittests	95.61% <100.00%> (-2.64%)	⬇️

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Files	Coverage Δ
wagtail_resume/models.py	94.73% <100.00%> (ø)

... and 1 file with indirect coverage changes

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