fix: use native path format for pytest subprocess args on Windows #290

Job	Run time
check-linked-issue	3s
determine-changes / detect	10s
coverage	7m 26s
type-check	27s
unit-tests (windows-latest, 3.13)	9m 39s
unit-tests (ubuntu-latest, 3.11)	6m 15s
unit-tests (ubuntu-latest, 3.10)	7m 22s
unit-tests (ubuntu-latest, 3.12)	7m 0s
unit-tests (ubuntu-latest, 3.13)	7m 38s
e2e-python (async-optimization, end_to_end_test_async.py, 10)	7m 2s
e2e-python (bubble-sort-unittest, end_to_end_test_bubblesort_unittest.py, 40)	7m 3s
unit-tests (ubuntu-latest, 3.9)	9m 19s
e2e-python (tracer-replay, end_to_end_test_tracer_replay.py, 10)	5m 4s
e2e-python (futurehouse-structure, end_to_end_test_futurehouse.py, 5)	3m 20s
e2e-python (coverage-e2e, end_to_end_test_coverage.py, black)	6m 32s
prek / prek	36s
e2e-python (topological-sort, end_to_end_test_topological_sort_worktree.py, 5)	3m 11s
e2e-python (bubble-sort-pytest-nogit, end_to_end_test_bubblesort_pytest.py, 70, true)	4m 16s
e2e-python (init-optimization, end_to_end_test_init_optimization.py, 10)	3m 21s
e2e-python (benchmark-bubble-sort, end_to_end_test_benchmark_sort.py, 5)	14m 46s
unit-tests (ubuntu-latest, 3.14)	6m 9s
e2e-java	0s
e2e-js	0s
required checks passed	3s
	1h 56m 42s

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