Build

Remove no longer supported CentOS 7 builds #437

Job	Run time
ubuntu (20.04)	7m 38s
oldschool (rockylinux, 9, debug)	4m 57s
ubuntu (22.04)	6m 38s
macOS (latest, 3.9, 5.9.*, release)	6m 29s
oldschool (rockylinux, 9, release)	4m 44s
macOS (latest, 3.9, 5.9.*, debug)	6m 5s
macOS (latest, 3.11, 5.12.*, debug)	4m 37s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 52s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 58s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 44s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 16s
	1h 2m 58s

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