Runs the tests nightly #804

Job	Run time
Run tests with Python 3.6 on ubuntu-20.04	7m 59s
Run tests with Python 3.6 on windows-latest	12m 37s
Run tests with Python 3.7 on ubuntu-20.04	8m 4s
Run tests with Python 3.7 on windows-latest	12m 52s
Run tests with Python 3.8 on ubuntu-20.04	8m 7s
Run tests with Python 3.8 on windows-latest	12m 30s
Run tests with Python 3.9 on ubuntu-20.04	8m 2s
Run tests with Python 3.9 on windows-latest	13m 10s
Run tests with Python 3.10 on ubuntu-20.04	8m 9s
Run tests with Python 3.10 on windows-latest	11m 54s
Run tests with Python 3.11 on ubuntu-20.04	8m 1s
Run tests with Python 3.11 on windows-latest	13m 2s
Run tests with Python pypy-3.9 on ubuntu-20.04	14m 0s
	2h 18m 27s

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