tests

Use pyproject.toml for flake8 #1224

Job	Run time
package-source	25s
py-3.9 lib-6.1 ubuntu-latest	6m 2s
style	17s
py-3.9 lib-6.1 windows-latest	4m 3s
py-3.9 lib-6.0 ubuntu-latest	4m 37s
py-3.9 lib-6.0 windows-latest	3m 8s
py-3.9 lib-5.1 ubuntu-latest	5m 5s
py-3.9 lib-5.1 windows-latest	3m 1s
py-pypy3.9 lib-6.1 ubuntu-latest	4m 25s
package-wheel (macos-latest, arm64)	12m 28s
py-3.9 lib-6.1 macos-latest	9m 43s
package-wheel (macos-latest, x86_64)	21m 7s
package-wheel (ubuntu-latest, aarch64)	2h 38m 4s
package-wheel (ubuntu-latest, i686)	17m 4s
package-wheel (ubuntu-latest, x86_64)	16m 44s
package-wheel (windows-latest, AMD64)	13m 33s
publish	35s
	4h 40m 21s

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