github actions: update to actions/upload-artifact@v4 #171

Job	Run time
CCM Integration tests (using Nix) / build	29m 18s
CCM Integration tests / build (3.8)	14m 14s
CCM Integration tests / build (3.11)	15m 35s
CCM Integration tests / build (3.12)	14m 52s
	1h 13m 59s

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