refactor: use PEP 548 compatible annotation

[12rambau]

Fix #309

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (020a067) to head (c40d71c).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #346      +/-   ##
==========================================
- Coverage   91.02%   90.75%   -0.28%     
==========================================
  Files          27       26       -1     
  Lines        1371     1330      -41     
  Branches       65       64       -1     
==========================================
- Hits         1248     1207      -41     
  Misses        107      107              
  Partials       16       16              

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