[PR #8297/d15f07cf backport][3.9] Upgrade to llhttp 9.2.1 (#8292)

[patchback]

This is a backport of PR #8297 as merged into 3.10 (d15f07c).

Fixes #8291.

(cherry picked from commit 4d72dca)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.41%. Comparing base (bb23105) to head (bf0ff35).

Additional details and impacted files

@@            Coverage Diff             @@
##              3.9    #8298      +/-   ##
==========================================
- Coverage   97.42%   97.41%   -0.01%     
==========================================
  Files         108      108              
  Lines       32800    32820      +20     
  Branches     3876     3879       +3     
==========================================
+ Hits        31956    31973      +17     
- Misses        640      641       +1     
- Partials      204      206       +2     

Flag	Coverage Δ
CI-GHA	97.33% <100.00%> (-0.01%)	⬇️
OS-Linux	97.00% <100.00%> (-0.01%)	⬇️
OS-Windows	94.60% <100.00%> (-0.01%)	⬇️
OS-macOS	96.72% <100.00%> (-0.01%)	⬇️
Py-3.10.11	94.42% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	96.79% <100.00%> (-0.01%)	⬇️
Py-3.11.8	97.04% <100.00%> (-0.01%)	⬇️
Py-3.12.2	97.09% <100.00%> (-0.01%)	⬇️
Py-3.8.10	94.40% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.72% <100.00%> (-0.01%)	⬇️
Py-3.9.13	94.41% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.78% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.15	96.31% <100.00%> (-0.01%)	⬇️
VM-macos	96.72% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.00% <100.00%> (-0.01%)	⬇️
VM-windows	94.60% <100.00%> (-0.01%)	⬇️

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