Build

Update checkout action for oldschool #247

Job	Run time
ubuntu (20.04)	22m 21s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 31s
ubuntu (22.04)	18m 26s
oldschool (centos, 7, python-debug, debug)	2m 25s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 1s
macOS (latest, 3.9, 5.9.*, release)	8m 39s
oldschool (centos, 7, python-debug, release)	2m 26s
windows (win64_msvc2019_64, 3.12, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 11s
macOS (latest, 3.9, 5.9.*, debug)	5m 37s
oldschool (rockylinux, 9, python3-devel, release)	5m 16s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 21s
macOS (latest, 3.11, 5.12.*, debug)	6m 9s
	1h 31m 23s

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