[PR #9851/541d86d backport][3.10] Fix incorrect parsing of chunk extensions with the pure Python parser

[bdraco]

(cherry picked from commit 541d86d)

[codspeed-hq]

CodSpeed Performance Report

Merging #9853 will not alter performance

_{Comparing patchback/backports/3.10/541d86d9e7884590c655876cd40042565293d8df/pr-9851 (bdc8863) with 3.10 (e5917cd)}

Summary

✅ 24 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.92%. Comparing base (158bf30) to head (bdc8863).
Report is 2 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9853   +/-   ##
=======================================
  Coverage   97.92%   97.92%           
=======================================
  Files         113      113           
  Lines       35837    35855   +18     
  Branches     4316     4319    +3     
=======================================
+ Hits        35092    35110   +18     
  Misses        553      553           
  Partials      192      192           

Flag	Coverage Δ
CI-GHA	97.81% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.51% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.12% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.21% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.07% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.01% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.08% <100.00%> (-0.01%)	⬇️
Py-3.11.9	97.15% <100.00%> (-0.01%)	⬇️
Py-3.12.7	97.58% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.57% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.51% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.85% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.98% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	96.97% <100.00%> (+0.04%)	⬆️
Py-pypy7.3.16	96.52% <78.94%> (-0.01%)	⬇️
VM-macos	97.21% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.51% <100.00%> (+<0.01%)	⬆️
VM-windows	95.12% <100.00%> (+<0.01%)	⬆️

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