Bump KyleMayes/install-llvm-action from 1.8.3 to 1.9.0 #105

Job	Run time
cargo-publish	0s
macos-docs	1m 51s
ios-check (stable, aarch64-apple-ios)	3m 15s
macos-test (stable)	1m 58s
ios-check (stable, x86_64-apple-ios)	2m 42s
macos-test (nightly)	3m 23s
ios-check (stable, aarch64-apple-ios-sim)	3m 13s
ios-check (nightly, aarch64-apple-ios)	2m 29s
ios-check (nightly, x86_64-apple-ios)	2m 46s
ios-check (nightly, aarch64-apple-ios-sim)	2m 8s
	23m 45s

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