Build

Fix crashes during and after PythonQt cleanup #554

Job	Run time
oldschool (rockylinux, 9, debug)	4m 25s
oldschool (rockylinux, 9, release)	4m 23s
ubuntu (24.04)	2m 6s
ubuntu (22.04)	4m 37s
macOS (latest, 3.9, 5.9.*, release)	4m 54s
macOS (latest, 3.9, 5.9.*, debug)	4m 48s
macOS (latest, 3.11, 5.12.*, debug)	6m 24s
windows (win32_mingw53, 3.6, x86, 5.11.*)	4m 22s
windows (win64_mingw73, 3.10, 5.12.*, x64)	4m 23s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 22s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	3m 56s
	48m 40s

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