[3.7] allow samesite in cookies (#4224)

[asvetlov]

(cherry picked from commit 1220613)

Co-authored-by: Samuel Colvin [email protected]

[codecov-io]

Codecov Report

Merging #4303 into 3.7 will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              3.7    #4303      +/-   ##
==========================================
- Coverage   97.93%   97.91%   -0.03%     
==========================================
  Files          44       44              
  Lines        8903     8907       +4     
  Branches     1391     1393       +2     
==========================================
+ Hits         8719     8721       +2     
- Misses         75       76       +1     
- Partials      109      110       +1

Impacted Files	Coverage Δ
aiohttp/web_response.py	97.98% <83.33%> (-0.21%)	⬇️
aiohttp/web_fileresponse.py	97.72% <0%> (-0.57%)	⬇️

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