Update download and upload artifacts actions to v4 ahead of deprecation #1477

Job	Run time
Test upstream llvm,clang / Lit Tests (ubuntu-22.04)	2h 7m 44s
Test upstream lld / Lit Tests (ubuntu-22.04)	41m 42s
Test upstream llvm,clang / Lit Tests (windows-2019)	1h 14m 17s
Test upstream lld / Lit Tests (windows-2019)	15m 26s
	4h 19m 9s

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