tests

Fix Windows CI (choose correct python executable) #1308

Job	Run time
canceller	2s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	9m 54s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 3s
tests-Windows-CLI (mingw64, x86_64, 3.8)	23m 18s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	6m 45s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	11m 21s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	21m 23s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 32s
tests-Windows-GUI (mingw64, x86_64)	12m 44s
tests-Unix-CLI (macos-13, 3.9)	16m 20s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	13m 1s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 20s
tests-Unix-CLI (macos-15, 3.9)	7m 18s
tests-Unix-GUI (macos-12, 5.9.5)	6m 0s
tests-windows-latest-pacman (mingw64, x86_64)	1m 52s
tests-Unix-GUI (macos-13, 5.15.2)	11m 1s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 48s
tests-Unix-GUI (macos-13, 6.7.2)	9m 44s
	2h 51m 26s

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