Use monkeypatch to monkeypatch. #1129

Job	Run time
test_cygwin (39, windows-latest)	5m 21s
collateral (diffcov)	45s
ci_setuptools (3.10, ubuntu-latest)	3m 41s
test (3.8, ubuntu-latest)	49s
collateral (docs)	29s
test (3.8, macos-latest)	1m 12s
test (3.8, windows-latest)	2m 15s
test_msvc_python_mingw	2m 0s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 42s
test (3.12, ubuntu-latest)	47s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 0s
test (3.12, macos-latest)	58s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 34s
test (3.12, windows-latest)	2m 17s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 40s
test (3.9, ubuntu-latest)	41s
test (3.10, ubuntu-latest)	53s
test (3.11, ubuntu-latest)	39s
test (pypy3.10, ubuntu-latest)	1m 35s
check	3s
release	0s
	31m 21s

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