Bump KyleMayes/install-llvm-action from 2.0.2 to 2.0.3 #130

Job	Run time
ios-check (stable, aarch64-apple-ios)	1m 51s
ios-check (stable, x86_64-apple-ios)	1m 15s
macos-docs	1m 16s
ios-check (stable, aarch64-apple-ios-sim)	1m 19s
macos-test (stable)	1m 29s
ios-check (nightly, aarch64-apple-ios)	1m 23s
macos-test (nightly)	1m 26s
ios-check (nightly, x86_64-apple-ios)	1m 24s
ios-check (nightly, aarch64-apple-ios-sim)	1m 37s
cargo-publish	0s
	13m 0s

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