Bump KyleMayes/install-llvm-action from 2.0.2 to 2.0.3 #129

Job	Run time
macos-test (stable)	2m 14s
macos-test (nightly)	3m 19s
macos-docs	2m 8s
ios-check (stable, aarch64-apple-ios)	1m 39s
ios-check (stable, x86_64-apple-ios)	1m 21s
cargo-publish	0s
ios-check (stable, aarch64-apple-ios-sim)	1m 28s
ios-check (nightly, aarch64-apple-ios)	1m 29s
ios-check (nightly, x86_64-apple-ios)	1m 24s
ios-check (nightly, aarch64-apple-ios-sim)	2m 39s
	17m 41s

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