[PR #7346/346fd202 backport][3.8]  Bump vendored llhttp to v8.1.1

[patchback]

This is a backport of PR #7346 as merged into master (346fd20).

It hasn't been updated in two years... It's time to upgrade to the latest version!

[codecov]

Codecov Report

Merging #7352 (d47e605) into 3.8 (a4bf0e8) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              3.8    #7352   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files         107      107           
  Lines       30996    30996           
  Branches     3924     3924           
=======================================
+ Hits        30188    30190    +2     
+ Misses        604      603    -1     
+ Partials      204      203    -1     

Flag	Coverage Δ
CI-GHA	97.26% <ø> (+<0.01%)	⬆️
OS-Linux	96.90% <ø> (ø)
OS-Windows	95.24% <ø> (+<0.01%)	⬆️
OS-macOS	96.65% <ø> (+<0.01%)	⬆️
Py-3.10.11	94.84% <ø> (-0.01%)	⬇️
Py-3.10.12	96.54% <ø> (ø)
Py-3.11.0	96.21% <ø> (ø)
Py-3.6.15	96.38% <ø> (+<0.01%)	⬆️
Py-3.6.8	94.76% <ø> (+<0.01%)	⬆️
Py-3.7.17	96.53% <ø> (ø)
Py-3.7.9	94.89% <ø> (ø)
Py-3.8.10	94.82% <ø> (ø)
Py-3.8.17	96.44% <ø> (ø)
Py-3.9.13	94.82% <ø> (+<0.01%)	⬆️
Py-3.9.17	96.46% <ø> (ø)
Py-pypy7.3.11	93.96% <ø> (+<0.01%)	⬆️
VM-macos-latest	96.65% <ø> (+<0.01%)	⬆️
VM-ubuntu-20.04	96.89% <ø> (ø)
VM-ubuntu-latest	96.43% <ø> (ø)
VM-windows-latest	95.24% <ø> (+<0.01%)	⬆️

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