Runs the tests nightly #821

Job	Run time
Run tests with Python 3.6 on ubuntu-20.04	8m 9s
Run tests with Python 3.6 on windows-latest	12m 44s
Run tests with Python 3.7 on ubuntu-20.04	8m 6s
Run tests with Python 3.7 on windows-latest	11m 48s
Run tests with Python 3.8 on ubuntu-20.04	7m 48s
Run tests with Python 3.8 on windows-latest	12m 57s
Run tests with Python 3.9 on ubuntu-20.04	8m 7s
Run tests with Python 3.9 on windows-latest	13m 0s
Run tests with Python 3.10 on ubuntu-20.04	8m 1s
Run tests with Python 3.10 on windows-latest	12m 40s
Run tests with Python 3.11 on ubuntu-20.04	8m 2s
Run tests with Python 3.11 on windows-latest	13m 4s
Run tests with Python pypy-3.9 on ubuntu-20.04	14m 4s
	2h 18m 30s

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