Fix bump llhttp to v8.1.1 (#7367)

[Dreamsorcerer]

(cherry picked from commit 41e2c4c)

[codecov]

Codecov Report

Merging #7376 (ec1675c) into 3.9 (2475971) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              3.9    #7376   +/-   ##
=======================================
  Coverage   97.27%   97.27%           
=======================================
  Files         107      107           
  Lines       31592    31593    +1     
  Branches     4010     4011    +1     
=======================================
+ Hits        30732    30733    +1     
  Misses        653      653           
  Partials      207      207           

Flag	Coverage Δ
CI-GHA	97.22% <100.00%> (+<0.01%)	⬆️
OS-Linux	96.90% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.52% <100.00%> (-0.01%)	⬇️
OS-macOS	96.58% <100.00%> (-0.01%)	⬇️
Py-3.10.11	94.43% <100.00%> (-0.01%)	⬇️
Py-3.10.12	96.78% <100.00%> (+<0.01%)	⬆️
Py-3.11.0	96.52% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.41% <100.00%> (-0.01%)	⬇️
Py-3.8.17	96.72% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	94.41% <100.00%> (-0.01%)	⬇️
Py-3.9.17	96.75% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	94.14% <100.00%> (-0.01%)	⬇️
VM-macos	96.58% <100.00%> (-0.01%)	⬇️
VM-ubuntu	96.90% <100.00%> (+<0.01%)	⬆️
VM-windows	94.52% <100.00%> (-0.01%)	⬇️

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

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