chore: add explicit package manager to root_deps fixture #98

Job	Run time
Determine jobs to run	18s
Build Turborepo (ubuntu, self-hosted, linux, x64, metal)	2m 4s
Turborepo Examples	0s
Turborepo rust check	0s
Build Turborepo (macos, macos-12)	6m 50s
Build Turborepo (windows, windows-latest)	11m 48s
Rust lints	0s
Turborepo rust clippy	0s
Turborepo Rust testing on ${{ matrix.os.name }}	0s
Turborepo Integration (ubuntu-latest)	10m 32s
Turborepo Integration (macos-12)	13m 10s
Turborepo Integration (windows-latest)	26m 17s
Cleanup / cleanup	2s
	1h 11m 1s

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