tests

Fix mambaforge warning #1309

Job	Run time
canceller	4s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	10m 2s
tests-Windows-CLI (mingw64, x86_64, 3.8)	23m 5s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	10m 10s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 8s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	21m 28s
tests-Unix-CLI (macos-13, 3.9)	20m 34s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	7m 37s
tests-Windows-GUI (mingw64, x86_64)	13m 22s
tests-Unix-CLI (macos-15, 3.9)	6m 28s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 29s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	12m 41s
tests-windows-latest-pacman (mingw64, x86_64)	1m 54s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 13s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 49s
tests-Unix-GUI (macos-12, 5.9.5)	5m 54s
tests-Unix-GUI (macos-13, 5.15.2)	12m 13s
tests-Unix-GUI (macos-13, 6.7.2)	12m 25s
	2h 58m 36s

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