MyPy show_error_codes deprecated

[DimitriPapadopoulos]

It is now the default, since MyPy v0.990.

Reference issue

The issue describing the bug or feature that this PR addresses.

Tasks

• Unit tests added that reproduce issue or prove feature is working
• Fix or feature added
• Documentation and examples updated (if relevant)
• Unit tests passing and coverage at 100% after adding fix/feature
• Type annotations updated and passing with mypy
• Apps updated and tested (if relevant)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.87%. Comparing base (4615d4d) to head (1ad24be).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1070   +/-   ##
=======================================
  Coverage   99.87%   99.87%           
=======================================
  Files          28       28           
  Lines        9012     9012           
=======================================
  Hits         9001     9001           
  Misses         11       11           

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