Specify llvm version number #2965

Job	Run time
Documentation	45s
Linting	19m 54s
Quick Checks	10s
ubuntu-22.04 / gcc / Debug	3m 33s
windows-2022 / Debug	6m 47s
ubuntu-22.04 / gcc / RelWithDebInfo	7m 54s
windows-2022 / RelWithDebInfo	5m 39s
ubuntu-20.04 / clang / Debug	3m 25s
ubuntu-20.04 / clang / RelWithDebInfo	3m 39s
macos-15 / clang / Debug	34m 55s
macos-15 / clang / RelWithDebInfo	36m 24s
	2h 3m 5s

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