Bump KyleMayes/install-llvm-action from 1.9.0 to 2.0.0 #117

Job	Run time
macos-docs	1m 35s
ios-check (stable, aarch64-apple-ios)	1m 55s
cargo-publish	0s
macos-test (stable)	2m 35s
ios-check (stable, x86_64-apple-ios)	2m 2s
ios-check (stable, aarch64-apple-ios-sim)	1m 58s
macos-test (nightly)	1m 58s
ios-check (nightly, aarch64-apple-ios)	1m 58s
ios-check (nightly, x86_64-apple-ios)	2m 25s
ios-check (nightly, aarch64-apple-ios-sim)	2m 25s
	18m 51s

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