mypy - reduce violations

[commonism]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.87179% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 94.30%. Comparing base (a5d7582) to head (b261eb2).

Files	Patch %	Lines
aiopenapi3/v20/glue.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage   94.33%   94.30%   -0.03%     
==========================================
  Files          85       85              
  Lines        7129     7133       +4     
==========================================
+ Hits         6725     6727       +2     
- Misses        404      406       +2     

Flag	Coverage Δ
core	94.20% <94.87%> (-0.05%)	⬇️
tests	94.45% <ø> (ø)

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