pytest on many platforms

Удалено упоминание dev ветки #115

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Run time

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Job	Run time
pytest (macos-latest, 3.7)	38s
pytest (macos-latest, 3.8)	45s
pytest (macos-latest, 3.9)	1m 0s
pytest (macos-latest, 3.10)	34s
pytest (macos-latest, 3.11)	36s
pytest (ubuntu-latest, 3.7)	23s
pytest (ubuntu-latest, 3.8)	19s
pytest (ubuntu-latest, 3.9)	22s
pytest (ubuntu-latest, 3.10)	18s
pytest (ubuntu-latest, 3.11)	17s
pytest (windows-latest, 3.7)	55s
pytest (windows-latest, 3.8)	48s
pytest (windows-latest, 3.9)	51s
pytest (windows-latest, 3.10)	47s
pytest (windows-latest, 3.11)	53s
	9m 26s