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chore(generator): Fix deprecated QFlags default constructor warning #658

Job	Run time
oldschool (rockylinux, 9, release)	5m 15s
oldschool (rockylinux, 9, debug)	4m 37s
ubuntu (24.04)	5m 32s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	5m 32s
macOS (latest, 3.9, 5.9.*, debug)	5m 36s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 57s
ubuntu (22.04)	5m 32s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 32s
macOS (latest, 3.9, 5.9.*, release)	5m 34s
macOS (latest, 3.11, 5.12.*, debug)	5m 37s
windows (win32_mingw53, 3.6, x86, 5.11.*)	5m 32s
	59m 16s

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