Improve performance of with_fragment

[bdraco]

Avoid calling SplitResult._replace since its much slower

[codspeed-hq]

CodSpeed Performance Report

Merging #1317 will improve performances by 84.01%

_{Comparing with_fragment (1b81de2) with master (96649e7)}

Summary

⚡ 1 improvements
✅ 75 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	with_fragment	Change
⚡	test_url_with_fragment	807.1 µs	438.6 µs	+84.01%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (96649e7) to head (1b81de2).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1317   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files          27       27           
  Lines        5373     5375    +2     
  Branches      326      326           
=======================================
+ Hits         5155     5157    +2     
  Misses        192      192           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.94% <100.00%> (+<0.01%)	⬆️
MyPy	44.51% <100.00%> (+0.02%)	⬆️
OS-Linux	99.31% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.37% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.04% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	99.01% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	99.01% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.27% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	98.97% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.22% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.27% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.17	99.29% <100.00%> (+<0.01%)	⬆️
VM-macos-latest	99.04% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.31% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.37% <100.00%> (+<0.01%)	⬆️
pytest	99.31% <100.00%> (+<0.01%)	⬆️

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[bdraco]

We don't have any benchmarks that actually alter the fragment