Build

Fix crashes during and after PythonQt cleanup #555

Job	Run time
oldschool (rockylinux, 9, release)	4m 24s
ubuntu (24.04)	2m 2s
oldschool (rockylinux, 9, debug)	4m 32s
ubuntu (22.04)	7m 10s
macOS (latest, 3.9, 5.9.*, release)	5m 7s
macOS (latest, 3.11, 5.12.*, debug)	4m 7s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 1s
macOS (latest, 3.9, 5.9.*, debug)	7m 23s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 43s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 16s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 39s
	55m 24s

Provide feedback