tests

Bump KyleMayes/install-llvm-action from 1 to 2 #604

Job	Run time
Tests on 32-bit Linux	4m 59s
C++ Tests on windows-latest	6m 27s
Python 3.7 Tests on ubuntu-latest	1m 43s
C++ Tests on windows-latest MinGW 13	7m 2s
Python 3.11 Tests on ubuntu-latest	1m 22s
C++ Tests on ubuntu-20.04 LLVM 8	2m 13s
Python pypy-3.9 Tests on ubuntu-latest	1m 37s
C++ Tests on ubuntu-20.04 GCC 8	2m 55s
C++ Tests on ubuntu-latest GCC 9	3m 37s
Python 3.7 Tests on macos-latest	1m 15s
C++ Tests on ubuntu-latest GCC 13	4m 4s
Python 3.11 Tests on macos-latest	2m 48s
C++ Tests on macos-latest	4m 2s
Python pypy-3.9 Tests on macos-latest	1m 19s
Python 3.7 Tests on windows-latest	1m 59s
Python 3.11 Tests on windows-latest	2m 43s
Python pypy-3.9 Tests on windows-latest	2m 53s
	52m 58s

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