tests

Fix issue with absolute path with Python 3.13 on Windows #1278

Job	Run time
test (3.9, ubuntu-latest)	42s
test_cygwin (39, windows-latest)	4m 56s
ci_setuptools (3.10, ubuntu-latest)	4m 2s
collateral (diffcov)	48s
collateral (docs)	26s
test (3.9, macos-latest)	1m 0s
test_msvc_python_mingw	2m 10s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 52s
test (3.9, windows-latest)	2m 7s
test_msys2_mingw (mingw32, i686, gcc, g++)	1m 45s
test (3.13, ubuntu-latest)	1m 13s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 50s
test (3.13, macos-latest)	41s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 42s
test (3.13, windows-latest)	2m 46s
test (3.10, ubuntu-latest)	43s
test (3.11, ubuntu-latest)	42s
test (3.12, ubuntu-latest)	46s
test (3.14, ubuntu-latest)	58s
test (pypy3.10, ubuntu-latest)	1m 38s
check	1s
release	0s
	32m 48s

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