Allow lax response parsing on Py parser (#7663)

[Dreamsorcerer]

(cherry picked from commit bd5f924)

[codecov]

Codecov Report

Merging #7665 (58f47f0) into 3.9 (009e246) will increase coverage by 0.00%.
Report is 3 commits behind head on 3.9.
The diff coverage is 97.39%.

@@           Coverage Diff           @@
##              3.9    #7665   +/-   ##
=======================================
  Coverage   97.31%   97.31%           
=======================================
  Files         107      107           
  Lines       31752    31821   +69     
  Branches     3690     3714   +24     
=======================================
+ Hits        30898    30966   +68     
  Misses        651      651           
- Partials      203      204    +1     

Flag	Coverage Δ
CI-GHA	97.22% <97.39%> (+<0.01%)	⬆️
OS-Linux	96.91% <97.39%> (+<0.01%)	⬆️
OS-Windows	94.42% <97.39%> (+0.02%)	⬆️
OS-macOS	96.56% <97.39%> (+0.01%)	⬆️
Py-3.10.11	94.33% <97.39%> (+0.02%)	⬆️
Py-3.10.13	96.75% <97.39%> (+<0.01%)	⬆️
Py-3.11.5	96.44% <90.43%> (-0.03%)	⬇️
Py-3.8.10	94.31% <97.39%> (+0.02%)	⬆️
Py-3.8.18	96.68% <97.39%> (+<0.01%)	⬆️
Py-3.9.13	94.31% <97.39%> (+0.02%)	⬆️
Py-3.9.18	96.72% <97.39%> (-0.01%)	⬇️
Py-pypy7.3.11	96.20% <90.43%> (-0.03%)	⬇️
VM-macos	96.56% <97.39%> (+0.01%)	⬆️
VM-ubuntu	96.91% <97.39%> (+<0.01%)	⬆️
VM-windows	94.42% <97.39%> (+0.02%)	⬆️

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Files	Coverage Δ
tests/test_http_parser.py	99.16% <100.00%> (+0.05%)	⬆️
aiohttp/http_parser.py	98.16% <94.54%> (-0.16%)	⬇️

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