Update to LLHTTP 9 (#7485)

[Dreamsorcerer]

(cherry picked from commit c0c7508)

[codecov]

Codecov Report

Merging #7487 (bbf98cf) into 3.8 (8129d26) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              3.8    #7487      +/-   ##
==========================================
- Coverage   97.38%   97.38%   -0.01%     
==========================================
  Files         107      107              
  Lines       31036    31029       -7     
  Branches     3933     3934       +1     
==========================================
- Hits        30225    30218       -7     
  Misses        606      606              
  Partials      205      205              

Flag	Coverage Δ
CI-GHA	97.25% <100.00%> (-0.01%)	⬇️
OS-Linux	96.90% <100.00%> (-0.01%)	⬇️
OS-Windows	95.22% <100.00%> (-0.01%)	⬇️
OS-macOS	96.63% <100.00%> (-0.01%)	⬇️
Py-3.10.11	94.83% <100.00%> (+<0.01%)	⬆️
Py-3.10.12	96.54% <100.00%> (+0.05%)	⬆️
Py-3.11.0	96.17% <0.00%> (-0.06%)	⬇️
Py-3.6.15	96.37% <100.00%> (-0.01%)	⬇️
Py-3.6.8	94.75% <100.00%> (-0.01%)	⬇️
Py-3.7.17	96.53% <100.00%> (-0.01%)	⬇️
Py-3.7.9	94.88% <100.00%> (-0.01%)	⬇️
Py-3.8.10	94.80% <100.00%> (-0.01%)	⬇️
Py-3.8.17	96.49% <100.00%> (+0.05%)	⬆️
Py-3.9.13	94.81% <100.00%> (-0.01%)	⬇️
Py-3.9.17	96.50% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.11	93.90% <0.00%> (-0.01%)	⬇️
VM-macos-latest	96.63% <100.00%> (-0.01%)	⬇️
VM-ubuntu-20.04	96.88% <100.00%> (-0.01%)	⬇️
VM-ubuntu-latest	96.39% <0.00%> (+<0.01%)	⬆️
VM-windows-latest	95.22% <100.00%> (-0.01%)	⬇️

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Files Changed	Coverage Δ
tests/test_http_parser.py	99.08% <100.00%> (-0.01%)	⬇️

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