Minimally migrate to pyproject.toml #483

Job	Run time
Linux docs	1m 6s
Linux meta	1m 0s
Linux mypy	54s
Linux pypy3	2m 34s
Linux pypy3	2m 32s
Python 3.7 on macos-13	2m 51s
Linux py37	1m 40s
Python 3.12 on macos-13	2m 54s
Python 3.7 on Windows x86	2m 34s
Python 3.12 (minimal build) on macos-13	2m 44s
Linux py38	1m 39s
Python 3.8 on Windows x86	2m 42s
Python 3.12 on macos-latest	1m 31s
Linux py39	1m 37s
Python 3.9 on Windows x86	2m 58s
Python 3.12 (minimal build) on macos-latest	1m 39s
Python 3.10 on Windows x86	2m 54s
Linux py310	1m 39s
Python 3.11 on Windows x86	3m 0s
Linux py311	1m 35s
Python 3.12 on Windows x86	2m 53s
Linux py312	1m 41s
Python 3.7 on Windows x64	1m 43s
Linux py312 system	2m 19s
Python 3.8 on Windows x64	1m 41s
Linux py312 minimal	1m 40s
Python 3.9 on Windows x64	2m 3s
Python 3.10 on Windows x64	2m 18s
Python 3.11 on Windows x64	2m 17s
Python 3.12 on Windows x64	1m 59s
	1h 2m 37s

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