GitHub: updated to Clang 16 #176

Job	Run time
cmake-build (Ubuntu - Clang, ubuntu-latest, Debug, clang-16, clang++-16, Unix Makefiles)	7m 19s
cmake-build (Windows - MSVC 2022, windows-latest, Debug, cl, cl, Visual Studio 17 2022)	9m 30s
	16m 49s

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