Update dependency mypy to v0.991

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mypy (source, changelog)	==0.971 -> ==0.991

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Release Notes

python/mypy

v0.991

Compare Source

v0.990

Compare Source

v0.982

Compare Source

v0.981

Compare Source

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Configuration

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[codecov]

Codecov Report

Merging #406 (f5c445e) into main (fb63076) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #406   +/-   ##
=======================================
  Coverage   95.45%   95.45%           
=======================================
  Files           5        5           
  Lines         308      308           
  Branches       43       43           
=======================================
  Hits          294      294           
  Misses          7        7           
  Partials        7        7