Upgrade actions/upload-artifact to v6 #915

Job	Run time
Test (windows-latest, net48, x64, Release)	3m 49s
Test (windows-latest, net8.0, x64, Release)	4m 20s
Test (ubuntu-latest, net8.0, x64, Release)	2m 56s
Test (ubuntu-latest, net10.0, x64, Release)	2m 33s
Test (windows-latest, net472, x64, Release)	3m 18s
Test (windows-latest, net10.0, x64, Release)	5m 23s
	22m 19s

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