Minimally migrate to pyproject.toml #493

Job	Run time
Python 3.7 on macos-13	2m 47s
Linux docs	1m 2s
Python 3.12 on macos-13	2m 51s
Linux meta	1m 0s
Python 3.12 (minimal build) on macos-13	2m 49s
Linux mypy	58s
Python 3.12 on macos-latest	1m 34s
Linux pypy3	2m 35s
Python 3.12 (minimal build) on macos-latest	1m 24s
Linux pypy3	2m 44s
Linux py37	1m 39s
Python 3.7 on Windows x86	2m 58s
Linux py38	1m 36s
Python 3.8 on Windows x86	2m 46s
Linux py39	1m 38s
Python 3.9 on Windows x86	2m 44s
Linux py310	1m 40s
Python 3.10 on Windows x86	2m 57s
Linux py311	1m 34s
Python 3.11 on Windows x86	2m 41s
Linux py312	1m 42s
Python 3.12 on Windows x86	3m 3s
Linux py312 system	2m 20s
Python 3.7 on Windows x64	2m 4s
Linux py312 minimal	1m 34s
Python 3.8 on Windows x64	2m 4s
Python 3.9 on Windows x64	2m 12s
Python 3.10 on Windows x64	2m 2s
Python 3.11 on Windows x64	2m 5s
Python 3.12 on Windows x64	2m 2s
	1h 3m 5s

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