Build

chore: Remove obsolete Python 2 compatibility code #594

Job	Run time
ubuntu (24.04)	10m 27s
ubuntu (22.04)	10m 28s
oldschool (rockylinux, 9, release)	6m 10s
oldschool (rockylinux, 9, debug)	3m 48s
macOS (latest, 3.9, 5.9.*, release)	10m 29s
windows (win64_mingw73, 3.10, 5.12.*, x64)	6m 5s
macOS (latest, 3.11, 5.12.*, debug)	8m 1s
windows (win32_mingw53, 3.6, x86, 5.11.*)	8m 1s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 3s
macOS (latest, 3.9, 5.9.*, debug)	10m 2s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	5m 4s
	1h 22m 38s

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