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Fix invalid handling of alreadyAllocatedCPPObject in PythonQtConv::Co… #706

Job	Run time
ubuntu (22.04)	14m 5s
ubuntu (24.04)	14m 52s
windows (win32_mingw53, 3.6, x86, 5.11.*)	8m 4s
macOS (latest, 3.9, 5.9.*, debug)	13m 47s
oldschool (rockylinux, 9, debug)	5m 19s
oldschool (rockylinux, 9, release)	4m 23s
windows (win64_mingw73, 3.10, 5.12.*, x64)	6m 20s
macOS (latest, 3.11, 5.12.*, debug)	11m 22s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 34s
macOS (latest, 3.9, 5.9.*, release)	9m 39s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 54s
	1h 37m 19s

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