Minimally migrate to pyproject.toml #485

Job	Run time
Python 3.7 on macos-13	2m 53s
Linux docs	1m 7s
Python 3.12 on macos-13	3m 6s
Python 3.7 on Windows x86	2m 40s
Linux meta	59s
Python 3.12 (minimal build) on macos-13	2m 48s
Linux mypy	54s
Python 3.8 on Windows x86	3m 5s
Python 3.12 on macos-latest	1m 31s
Linux pypy3	2m 36s
Python 3.9 on Windows x86	2m 40s
Linux pypy3	2m 20s
Python 3.12 (minimal build) on macos-latest	1m 22s
Python 3.10 on Windows x86	2m 22s
Linux py37	1m 41s
Python 3.11 on Windows x86	2m 15s
Linux py38	1m 42s
Python 3.12 on Windows x86	2m 45s
Linux py39	1m 43s
Python 3.7 on Windows x64	2m 6s
Linux py310	1m 39s
Linux py311	1m 34s
Linux py312	1m 44s
Python 3.8 on Windows x64	2m 2s
Linux py312 system	1m 51s
Python 3.9 on Windows x64	2m 2s
Linux py312 minimal	1m 37s
Python 3.10 on Windows x64	2m 2s
Python 3.11 on Windows x64	2m 3s
Python 3.12 on Windows x64	2m 19s
	1h 1m 28s

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