Minimally migrate to pyproject.toml #489

Job	Run time
Python 3.7 on macos-13	2m 56s
Linux docs	1m 7s
Python 3.12 on macos-13	2m 54s
Linux meta	1m 1s
Python 3.12 (minimal build) on macos-13	3m 0s
Python 3.7 on Windows x86	2m 14s
Linux mypy	1m 3s
Python 3.12 on macos-latest	1m 36s
Python 3.8 on Windows x86	2m 37s
Linux pypy3	2m 35s
Python 3.12 (minimal build) on macos-latest	2m 21s
Python 3.9 on Windows x86	2m 26s
Linux pypy3	2m 39s
Linux py37	1m 38s
Python 3.10 on Windows x86	2m 40s
Linux py38	1m 36s
Python 3.11 on Windows x86	2m 43s
Linux py39	1m 35s
Python 3.12 on Windows x86	2m 46s
Linux py310	1m 37s
Python 3.7 on Windows x64	2m 12s
Linux py311	1m 38s
Python 3.8 on Windows x64	2m 13s
Python 3.9 on Windows x64	1m 41s
Linux py312	1m 41s
Python 3.10 on Windows x64	2m 6s
Linux py312 system	2m 29s
Python 3.11 on Windows x64	2m 23s
Linux py312 minimal	1m 34s
Python 3.12 on Windows x64	2m 30s
	1h 3m 31s

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