Devops: Move package configuration entirely to `pyproject.toml` #324

Job	Run time
ubuntu-postgres-action (3.9, testpw)	36s
ubuntu-postgres-service (3.9, testpw)	49s
pre-commit	27s
multi-conda (3.8, macos-12)	1m 33s
multi-conda (3.8, windows-2022)	3m 39s
ubuntu-apt (3.8, ubuntu-20.04)	59s
ubuntu-apt (3.8, ubuntu-22.04)	41s
ubuntu-apt (3.11, ubuntu-20.04)	38s
ubuntu-apt (3.11, ubuntu-22.04)	36s
	9m 58s

Provide feedback