LLVM CI

Fix LLVM version detection for `-rc1` #1628

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Job	Run time
LLVM 13	27m 41s
LLVM 14	27m 55s
LLVM 15	25m 44s
LLVM 16	26m 56s
LLVM 17	27m 15s
LLVM 18	26m 40s
LLVM 19	26m 38s
	3h 8m 49s