chore: Remove Mypy 'show_error_codes' as now default

[matthewfeickert]

Description

sp-repo-review MY102: Mypy show_error_codes deprecated: Must not have show_error_codes. Use hide_error_codes instead (since Mypy v0.990).

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• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

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For the PR Assignees:

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* sp-repo-review MY102: Mypy show_error_codes deprecated
  Must not have show_error_codes. Use hide_error_codes instead (since Mypy v0.990).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4fdd6d6) 98.28% compared to head (3039a37) 98.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2414   +/-   ##
=======================================
  Coverage   98.28%   98.28%           
=======================================
  Files          69       69           
  Lines        4539     4539           
  Branches      803      803           
=======================================
  Hits         4461     4461           
  Misses         45       45           
  Partials       33       33           

Flag	Coverage Δ
contrib	97.86% <ø> (ø)
doctest	60.71% <ø> (ø)
unittests-3.10	96.29% <ø> (ø)
unittests-3.11	96.29% <ø> (ø)
unittests-3.8	96.32% <ø> (ø)
unittests-3.9	96.34% <ø> (ø)

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