GitHub: Upgrade to upload/download-artifact v4 #1227

Job	Run time
Run CI / Build / Build	1m 9s
Run CI / Generate docs / Generate docs	52s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.8)	49s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.9)	53s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.10)	50s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.11)	45s
Run CI / Run unit tests / Run unit tests (ubuntu-latest, 3.12)	1m 0s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.8)	1m 31s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.9)	1m 10s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.10)	1m 14s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.11)	1m 31s
Run CI / Run unit tests / Run unit tests (windows-latest, 3.12)	1m 31s
Run CI / Run system tests / Run system tests (win-10-py32)	36m 27s
Run CI / Run system tests / Run system tests (win-10-py64)	34m 16s
Run CI / Report test results / Report test results	16s
	1h 24m 14s

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