Avoid copying list to reverse segments when making children

[bdraco]

Followup to #1248 (comment)
segments = list(reversed(path.split("/"))) can be replaced with segments = path.split("/") : segments.reverse() which avoids the copy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.81%. Comparing base (404b542) to head (bffb1d6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1250   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files          27       27           
  Lines        5142     5143    +1     
  Branches      310      310           
=======================================
+ Hits         4927     4928    +1     
  Misses        189      189           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.80% <100.00%> (+<0.01%)	⬆️
MyPy	43.69% <100.00%> (+0.01%)	⬆️
OS-Linux	99.35% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.41% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	98.96% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	98.96% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	98.91% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	99.18% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	98.91% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.18% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	99.23% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.23% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.17	99.26% <100.00%> (+<0.01%)	⬆️
VM-macos-latest	99.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.35% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.41% <100.00%> (+<0.01%)	⬆️
pytest	99.35% <100.00%> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #1250 will improve performances by 9.45%

_{Comparing reduce_list_copy_make_child (bffb1d6) with master (404b542)}

Summary

⚡ 1 improvements
✅ 40 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	reduce_list_copy_make_child	Change
⚡	test_url_joinpath_with_truediv	1.7 ms	1.6 ms	+9.45%