Bump KyleMayes/install-llvm-action from 1.8.3 to 1.9.0 #106

Job	Run time
macos-docs	1m 52s
cargo-publish	0s
ios-check (stable, aarch64-apple-ios)	1m 59s
macos-test (stable)	1m 51s
ios-check (stable, x86_64-apple-ios)	3m 0s
macos-test (nightly)	2m 11s
ios-check (stable, aarch64-apple-ios-sim)	2m 34s
ios-check (nightly, aarch64-apple-ios)	2m 53s
ios-check (nightly, x86_64-apple-ios)	3m 26s
ios-check (nightly, aarch64-apple-ios-sim)	2m 43s
	22m 29s

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