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Install course dependencies from manifest pins #33

Job	Run time
latest-stable (ubuntu-24.04)	47s
fresh (macos-14, readme, MSVC=true)	1m 25s
fresh (windows-2025, readme, MSVC=false)	2m 36s
latest-stable (windows-2025)	1m 25s
fresh (Linux without a compiler, readme)	1m 20s
fresh (macos-14, cold, MSVC=true)	1m 25s
fresh (Linux without a compiler, cold)	2m 25s
fresh (windows-2022, readme, MSVC=true)	2m 36s
d2x download and pinned install	1m 25s
latest-stable (macos-14)	1m 25s
fresh (windows-2025, cold, MSVC=true)	1m 25s
fresh (windows-2025, readme, MSVC=true)	1m 25s
fresh (windows-2022, cold, MSVC=true)	1m 25s
fresh (windows-2025, cold, MSVC=false)	1m 25s
cold-diagnostics	0s
	22m 29s