Build

chore: Improve const correctness #615

Job	Run time
ubuntu (22.04)	16s
oldschool (rockylinux, 9, release)	19s
oldschool (rockylinux, 9, debug)	19s
macOS (latest, 3.9, 5.9.*, release)	18s
macOS (latest, 3.11, 5.12.*, debug)	20s
macOS (latest, 3.9, 5.9.*, debug)	19s
windows (win64_mingw73, 3.10, 5.12.*, x64)	24s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	29s
windows (win32_mingw53, 3.6, x86, 5.11.*)	25s
ubuntu (24.04)	19s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	25s
	3m 53s

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