Migrate CI pipeline to actions/upload-artifact@v4 #1141

Job	Run time
Run tests with different pydantic versions	3m 44s
Run tests (3.8)	2m 11s
Run linters (flake8)	1m 55s
Run tests with coverage	3m 15s
Run tests (3.9)	2m 10s
Run linters (pydocstyle)	1m 56s
Run tests (3.10)	2m 8s
Run linters (mypy)	1m 59s
Run tests on legacy versions (3.7)	2m 24s
Run tests (3.11)	2m 7s
Run linters (pylint)	2m 4s
Run tests (3.12)	2m 12s
Run tests (3.13)	2m 22s
	30m 27s

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