Minimally migrate to pyproject.toml #494

Job	Run time
Python 3.7 on macos-13	2m 45s
Linux docs	1m 3s
Python 3.12 on macos-13	2m 59s
Python 3.7 on Windows x86	3m 2s
Linux meta	59s
Python 3.8 on Windows x86	2m 26s
Python 3.12 (minimal build) on macos-13	2m 52s
Linux mypy	56s
Python 3.9 on Windows x86	2m 40s
Python 3.12 on macos-latest	1m 28s
Linux pypy3	2m 52s
Python 3.12 (minimal build) on macos-latest	1m 23s
Python 3.10 on Windows x86	2m 10s
Linux pypy3	2m 41s
Python 3.11 on Windows x86	2m 59s
Linux py37	1m 35s
Python 3.12 on Windows x86	3m 0s
Linux py38	1m 33s
Python 3.7 on Windows x64	2m 18s
Python 3.8 on Windows x64	1m 55s
Linux py39	1m 38s
Linux py310	1m 42s
Python 3.9 on Windows x64	1m 46s
Linux py311	1m 34s
Python 3.10 on Windows x64	2m 4s
Linux py312	1m 41s
Python 3.11 on Windows x64	1m 52s
Linux py312 system	2m 11s
Linux py312 minimal	1m 41s
Python 3.12 on Windows x64	2m 18s
	1h 2m 3s

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