Devops: Move package configuration entirely to `pyproject.toml` #321

Job	Run time
multi-conda (3.8, macos-12)	1m 26s
pre-commit	30s
multi-conda (3.8, windows-2022)	3m 9s
ubuntu-apt (3.8, ubuntu-20.04)	43s
ubuntu-postgres-action (3.9, testpw)	34s
ubuntu-apt (3.8, ubuntu-22.04)	1m 0s
ubuntu-apt (3.11, ubuntu-20.04)	38s
ubuntu-postgres-service (3.9, testpw)	43s
ubuntu-apt (3.11, ubuntu-22.04)	40s
	9m 23s

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