Runs the tests nightly #766

Job	Run time
Run tests with Python 3.6 on ubuntu-20.04	8m 40s
Run tests with Python 3.6 on windows-latest	14m 10s
Run tests with Python 3.7 on ubuntu-20.04	8m 33s
Run tests with Python 3.7 on windows-latest	13m 50s
Run tests with Python 3.8 on ubuntu-20.04	8m 14s
Run tests with Python 3.8 on windows-latest	13m 54s
Run tests with Python 3.9 on ubuntu-20.04	8m 34s
Run tests with Python 3.9 on windows-latest	14m 14s
Run tests with Python 3.10 on ubuntu-20.04	8m 44s
Run tests with Python 3.10 on windows-latest	14m 6s
Run tests with Python 3.11 on ubuntu-20.04	8m 18s
Run tests with Python 3.11 on windows-latest	14m 21s
Run tests with Python pypy-3.9 on ubuntu-20.04	13m 54s
	2h 29m 32s

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