Minimally migrate to pyproject.toml #477

Job	Run time
Linux docs	1m 2s
Python 3.7 on macos-13	2m 47s
Linux meta	1m 2s
Python 3.7 on Windows x86	2m 36s
Python 3.12 on macos-13	3m 3s
Python 3.8 on Windows x86	2m 38s
Linux mypy	55s
Python 3.12 (minimal build) on macos-13	2m 53s
Linux pypy3	2m 49s
Python 3.9 on Windows x86	2m 34s
Linux pypy3	2m 41s
Python 3.10 on Windows x86	2m 46s
Linux py37	1m 46s
Python 3.11 on Windows x86	2m 57s
Python 3.12 on macos-latest	1m 38s
Python 3.12 on Windows x86	2m 57s
Linux py38	1m 41s
Python 3.12 (minimal build) on macos-latest	1m 23s
Python 3.7 on Windows x64	2m 14s
Linux py39	1m 35s
Python 3.8 on Windows x64	2m 1s
Linux py310	1m 40s
Python 3.9 on Windows x64	2m 0s
Linux py311	1m 34s
Python 3.10 on Windows x64	1m 58s
Linux py312	1m 42s
Linux py312 system	2m 23s
Python 3.11 on Windows x64	2m 9s
Linux py312 minimal	1m 48s
Python 3.12 on Windows x64	2m 9s
	1h 3m 21s

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