Minimally migrate to pyproject.toml #476

Job	Run time
Python 3.6 on macos-13	45s
Python 3.6 on Windows x86	1m 23s
Python 3.12 on macos-13	1m 0s
Python 3.7 on Windows x86	1m 29s
Python 3.12 (minimal build) on macos-13	1m 0s
Python 3.8 on Windows x86	1m 31s
Linux docs	36s
Python 3.12 on macos-latest	1m 2s
Python 3.9 on Windows x86	1m 30s
Python 3.12 (minimal build) on macos-latest	1m 0s
Python 3.10 on Windows x86	1m 30s
Linux meta	36s
Python 3.11 on Windows x86	1m 30s
Linux mypy	35s
Python 3.12 on Windows x86	1m 31s
Linux pypy3	36s
Python 3.6 on Windows x64	1m 20s
Linux pypy3	35s
Python 3.7 on Windows x64	1m 25s
Linux py36	22s
Python 3.8 on Windows x64	1m 23s
Linux py37	36s
Python 3.9 on Windows x64	1m 23s
Linux py38	36s
Python 3.10 on Windows x64	1m 25s
Linux py39	36s
Python 3.11 on Windows x64	1m 28s
Linux py310	36s
Python 3.12 on Windows x64	1m 26s
Linux py311	37s
Linux py312	36s
Linux py312 system	36s
Linux py312 minimal	35s
	33m 9s

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