Build and test Flang

[workflows] Update CI to use actions/upload-artifact@v4 #135

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Run time

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Job	Run time
build (AArch64, clang, clang++, 14)	12m 28s
build (AArch64, clang, clang++, 15)	12m 49s
build (AArch64, gcc, g++, 12)	13m 35s
	38m 52s