Migrate CI pipeline to actions/upload-artifact@v4 #1140

Job	Run time
Run tests with coverage	3m 23s
Run linters (flake8)	1m 53s
Run tests with different pydantic versions	3m 59s
Run tests (3.8)	2m 9s
Run linters (pydocstyle)	1m 56s
Run tests (3.9)	2m 14s
Run linters (mypy)	2m 4s
Run tests on legacy versions (3.7)	2m 13s
Run tests (3.10)	2m 9s
Run linters (pylint)	1m 59s
Run tests (3.11)	2m 6s
Run tests (3.12)	2m 10s
Run tests (3.13)	2m 21s
	30m 36s

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