Drop deprecated ClientResponseError.code attribute

[asvetlov]

No description provided.

[codecov-io]

Codecov Report

Merging #3934 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3934      +/-   ##
==========================================
+ Coverage   97.72%   97.76%   +0.03%     
==========================================
  Files          43       43              
  Lines        8799     9023     +224     
  Branches     1383     1482      +99     
==========================================
+ Hits         8599     8821     +222     
- Misses         86       91       +5     
+ Partials      114      111       -3

Impacted Files	Coverage Δ
aiohttp/client_exceptions.py	91.3% <ø> (-1.22%)	⬇️
aiohttp/connector.py	97.78% <0%> (+0.53%)	⬆️

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