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CI: Fix syntax for rustup components. #247

Job	Run time
Cross-compile for aarch64 linux	51s
build (ubuntu-20.04, stable, false)	1m 33s
build (windows-2019, stable, false)	3m 14s
build (macos-14, stable, false)	1m 25s
build (ubuntu-20.04, nightly, true)	1m 9s
build (windows-2019, nightly, true)	3m 14s
build (macos-14, nightly, true)	49s
	12m 15s

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