Bump KyleMayes/install-llvm-action from 1.9.0 to 2.0.0 #118

Job	Run time
macos-docs	1m 32s
macos-test (stable)	2m 22s
ios-check (stable, aarch64-apple-ios)	2m 45s
ios-check (stable, x86_64-apple-ios)	1m 56s
macos-test (nightly)	2m 37s
ios-check (stable, aarch64-apple-ios-sim)	2m 32s
cargo-publish	0s
ios-check (nightly, aarch64-apple-ios)	2m 34s
ios-check (nightly, x86_64-apple-ios)	2m 10s
ios-check (nightly, aarch64-apple-ios-sim)	2m 12s
	20m 40s

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