Runs the tests nightly #782

Job	Run time
Run tests with Python 3.6 on ubuntu-20.04	8m 45s
Run tests with Python 3.6 on windows-latest	15m 22s
Run tests with Python 3.7 on ubuntu-20.04	8m 55s
Run tests with Python 3.7 on windows-latest	13m 50s
Run tests with Python 3.8 on ubuntu-20.04	8m 24s
Run tests with Python 3.8 on windows-latest	13m 59s
Run tests with Python 3.9 on ubuntu-20.04	8m 40s
Run tests with Python 3.9 on windows-latest	14m 37s
Run tests with Python 3.10 on ubuntu-20.04	8m 18s
Run tests with Python 3.10 on windows-latest	13m 56s
Run tests with Python 3.11 on ubuntu-20.04	8m 42s
Run tests with Python 3.11 on windows-latest	14m 19s
Run tests with Python pypy-3.9 on ubuntu-20.04	15m 57s
	2h 33m 44s

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