Drop legacy yarl compatibility

[Dreamsorcerer]

Will leave it for v4 though.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (0478f14) to head (3ddb6b3).
Report is 1051 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8909      +/-   ##
==========================================
+ Coverage   98.24%   98.25%   +0.01%     
==========================================
  Files         107      107              
  Lines       34130    34125       -5     
  Branches     4050     4048       -2     
==========================================
- Hits        33531    33530       -1     
+ Misses        423      421       -2     
+ Partials      176      174       -2     

Flag	Coverage Δ
CI-GHA	98.15% <100.00%> (+0.01%)	⬆️
OS-Linux	97.81% <100.00%> (+0.01%)	⬆️
OS-Windows	96.21% <100.00%> (+0.01%)	⬆️
OS-macOS	97.48% <100.00%> (+0.01%)	⬆️
Py-3.10.11	97.58% <100.00%> (+0.01%)	⬆️
Py-3.10.14	97.51% <100.00%> (+0.01%)	⬆️
Py-3.11.9	97.74% <100.00%> (+0.01%)	⬆️
Py-3.12.4	96.01% <100.00%> (+0.01%)	⬆️
Py-3.12.5	97.54% <100.00%> (+0.01%)	⬆️
Py-3.9.13	97.47% <100.00%> (+0.01%)	⬆️
Py-3.9.19	97.41% <100.00%> (+0.01%)	⬆️
Py-pypy7.3.16	97.01% <100.00%> (+<0.01%)	⬆️
VM-macos	97.48% <100.00%> (+0.01%)	⬆️
VM-ubuntu	97.81% <100.00%> (+0.01%)	⬆️
VM-windows	96.21% <100.00%> (+0.01%)	⬆️

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