[pre-commit.ci] pre-commit autoupdate

[pre-commit-ci]

updates:

• github.com/PyCQA/flake8: 4.0.1 → 5.0.4

[codecov]

Codecov Report

Merging #138 (8cbb114) into main (4d6b077) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #138   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files           4        4           
  Lines         714      714           
=======================================
  Hits          707      707           
  Misses          7        7           

Flag	Coverage Δ
unittests	99.01% <ø> (ø)

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