Allow lax response parsing on Py parser (#7663)

[Dreamsorcerer]

(cherry picked from commit bd5f924)

[codecov]

Codecov Report

Merging #7664 (79686be) into 3.8 (8a3977a) will decrease coverage by 0.07%.
Report is 1 commits behind head on 3.8.
The diff coverage is 90.75%.

@@            Coverage Diff             @@
##              3.8    #7664      +/-   ##
==========================================
- Coverage   97.37%   97.30%   -0.07%     
==========================================
  Files         107      107              
  Lines       31049    31122      +73     
  Branches     3940     3965      +25     
==========================================
+ Hits        30233    30284      +51     
- Misses        610      631      +21     
- Partials      206      207       +1     

Flag	Coverage Δ
CI-GHA	97.16% <89.91%> (-0.07%)	⬇️
OS-Linux	96.80% <89.91%> (-0.09%)	⬇️
OS-Windows	95.20% <89.91%> (-0.02%)	⬇️
OS-macOS	96.61% <89.91%> (-0.01%)	⬇️
Py-3.10.11	94.81% <89.07%> (-0.02%)	⬇️
Py-3.10.13	96.45% <89.07%> (-0.08%)	⬇️
Py-3.11.0	96.12% <85.71%> (-0.04%)	⬇️
Py-3.6.15	96.33% <89.07%> (-0.03%)	⬇️
Py-3.6.8	94.72% <89.07%> (-0.02%)	⬇️
Py-3.7.17	96.49% <89.07%> (-0.03%)	⬇️
Py-3.7.9	94.85% <89.07%> (-0.02%)	⬇️
Py-3.8.10	94.78% <89.07%> (-0.02%)	⬇️
Py-3.8.18	96.39% <89.07%> (-0.03%)	⬇️
Py-3.9.13	94.78% <89.07%> (-0.01%)	⬇️
Py-3.9.18	96.42% <89.07%> (-0.08%)	⬇️
Py-pypy7.3.11	?
VM-macos-latest	96.61% <89.91%> (-0.01%)	⬇️
VM-ubuntu-20.04	96.80% <89.91%> (-0.08%)	⬇️
VM-ubuntu-latest	96.12% <85.71%> (-0.26%)	⬇️
VM-windows-latest	95.20% <89.91%> (-0.02%)	⬇️

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Files	Coverage Δ
aiohttp/http_parser.py	97.40% <94.91%> (-0.12%)	⬇️
tests/test_http_parser.py	97.72% <86.66%> (-0.87%)	⬇️

... and 3 files with indirect coverage changes

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