Upgrade to llhttp 9.2.1 (#8292)

[Dreamsorcerer]

Fixes #8291.

(cherry picked from commit 4d72dca)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.51%. Comparing base (38dd9b8) to head (eb35e55).

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #8297      +/-   ##
==========================================
- Coverage   97.51%   97.51%   -0.01%     
==========================================
  Files         108      108              
  Lines       33250    33270      +20     
  Branches     3960     3963       +3     
==========================================
+ Hits        32425    32442      +17     
- Misses        622      623       +1     
- Partials      203      205       +2     

Flag	Coverage Δ
CI-GHA	97.42% <100.00%> (-0.01%)	⬇️
OS-Linux	97.09% <100.00%> (-0.01%)	⬇️
OS-Windows	94.73% <100.00%> (-0.01%)	⬇️
OS-macOS	96.81% <100.00%> (-0.01%)	⬇️
Py-3.10.11	94.55% <100.00%> (-0.01%)	⬇️
Py-3.10.14	96.88% <100.00%> (-0.01%)	⬇️
Py-3.11.8	97.07% <100.00%> (-0.01%)	⬇️
Py-3.12.2	97.18% <100.00%> (-0.01%)	⬇️
Py-3.8.10	94.48% <100.00%> (-0.01%)	⬇️
Py-3.8.18	96.73% <100.00%> (-0.01%)	⬇️
Py-3.9.13	94.53% <100.00%> (-0.01%)	⬇️
Py-3.9.19	96.85% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.15	96.39% <100.00%> (-0.01%)	⬇️
VM-macos	96.81% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.09% <100.00%> (-0.01%)	⬇️
VM-windows	94.73% <100.00%> (-0.01%)	⬇️

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[patchback]

Backport to 3.9: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.9/d15f07cfbbdecf3de8ca1db10ca5d182ace7b09c/pr-8297

Backported as #8298

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