Prefer os.PathLike in convert_path #1018

Job	Run time
collateral (diffcov)	1m 5s
test (3.8, ubuntu-latest)	45s
test_cygwin (39, windows-latest)	6m 28s
collateral (docs)	29s
test (3.8, macos-latest)	1m 9s
ci_setuptools (3.10, ubuntu-latest)	3m 48s
test (3.8, windows-latest)	2m 12s
test (3.12, ubuntu-latest)	52s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	2m 13s
test (3.12, macos-latest)	55s
test_msys2_mingw (mingw32, i686, gcc, g++)	3m 0s
test (3.12, windows-latest)	2m 0s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	2m 24s
test (3.9, ubuntu-latest)	42s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	2m 20s
test (3.10, ubuntu-latest)	45s
test (3.11, ubuntu-latest)	37s
test (pypy3.10, ubuntu-latest)	1m 34s
check	3s
release	0s
	33m 21s

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