Fix bump llhttp to v8.1.1 (#7367)

[Dreamsorcerer]

(cherry picked from commit 41e2c4c)

[codecov]

Codecov Report

Merging #7377 (52e61de) into 3.8 (f07e9b4) will increase coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.8    #7377      +/-   ##
==========================================
+ Coverage   96.99%   97.38%   +0.39%     
==========================================
  Files         107      107              
  Lines       30999    31000       +1     
  Branches     3244     3926     +682     
==========================================
+ Hits        30067    30189     +122     
+ Misses        713      606     -107     
+ Partials      219      205      -14     

Flag	Coverage Δ
CI-GHA	97.24% <100.00%> (+0.36%)	⬆️
OS-Linux	96.90% <100.00%> (+0.01%)	⬆️
OS-Windows	95.22% <100.00%> (?)
OS-macOS	96.63% <100.00%> (?)
Py-3.10.11	94.82% <100.00%> (?)
Py-3.10.12	96.48% <100.00%> (+0.15%)	⬆️
Py-3.11.0	96.20% <100.00%> (?)
Py-3.6.15	96.36% <100.00%> (+0.16%)	⬆️
Py-3.6.8	94.74% <100.00%> (?)
Py-3.7.17	96.52% <100.00%> (?)
Py-3.7.9	94.87% <100.00%> (?)
Py-3.8.10	94.80% <100.00%> (?)
Py-3.8.17	96.43% <100.00%> (?)
Py-3.9.13	94.80% <100.00%> (?)
Py-3.9.17	96.50% <100.00%> (+0.19%)	⬆️
Py-pypy7.3.11	93.94% <100.00%> (?)
VM-macos-latest	96.63% <100.00%> (?)
VM-ubuntu-20.04	96.88% <100.00%> (-0.01%)	⬇️
VM-ubuntu-latest	96.43% <100.00%> (?)
VM-windows-latest	95.22% <100.00%> (?)

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Impacted Files	Coverage Δ
tests/test_http_parser.py	99.08% <100.00%> (+<0.01%)	⬆️

... and 17 files with indirect coverage changes

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