Remove yarl back-compat shims for yarl older than 1.13.0 (#9316)

[bdraco]

(cherry picked from commit c2eb67e)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (0604da9) to head (ed52b34).
Report is 1 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9317   +/-   ##
=======================================
  Coverage   97.79%   97.80%           
=======================================
  Files         108      108           
  Lines       34975    34961   -14     
  Branches     4177     4169    -8     
=======================================
- Hits        34204    34192   -12     
+ Misses        574      573    -1     
+ Partials      197      196    -1     

Flag	Coverage Δ
CI-GHA	97.68% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.37% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.94% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.04% <76.92%> (+0.01%)	⬆️
Py-3.10.15	96.97% <76.92%> (+0.01%)	⬆️
Py-3.11.10	96.94% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.01% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	97.41% <100.00%> (+<0.01%)	⬆️
Py-3.13.0-rc.2	97.39% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.95% <76.92%> (+0.01%)	⬆️
Py-3.9.20	96.89% <76.92%> (+0.01%)	⬆️
Py-pypy7.3.16	96.49% <76.92%> (+0.01%)	⬆️
VM-macos	97.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.37% <100.00%> (+<0.01%)	⬆️
VM-windows	94.94% <100.00%> (+<0.01%)	⬆️

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