Migrate CI pipeline to actions/upload-artifact@v4 #1139

Job	Run time
Run tests with coverage	3m 22s
Run tests with different pydantic versions	3m 59s
Run tests (3.8)	2m 15s
Run linters (flake8)	2m 0s
Run tests (3.9)	2m 9s
Run linters (pydocstyle)	2m 1s
Run tests (3.10)	2m 14s
Run tests on legacy versions (3.7)	2m 14s
Run linters (mypy)	1m 58s
Run tests (3.11)	2m 16s
Run linters (pylint)	2m 6s
Run tests (3.12)	2m 20s
Run tests (3.13)	2m 27s
	31m 21s

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