Runs the tests nightly #705

Job	Run time
Run tests with Python 3.6 on ubuntu-20.04	8m 13s
Run tests with Python 3.6 on windows-latest	14m 16s
Run tests with Python 3.7 on ubuntu-20.04	8m 24s
Run tests with Python 3.7 on windows-latest	14m 37s
Run tests with Python 3.8 on ubuntu-20.04	8m 52s
Run tests with Python 3.8 on windows-latest	15m 29s
Run tests with Python 3.9 on ubuntu-20.04	8m 19s
Run tests with Python 3.9 on windows-latest	14m 15s
Run tests with Python 3.10 on ubuntu-20.04	8m 47s
Run tests with Python 3.10 on windows-latest	15m 53s
Run tests with Python 3.11 on ubuntu-20.04	8m 22s
Run tests with Python 3.11 on windows-latest	15m 10s
Run tests with Python pypy-3.9 on ubuntu-20.04	19m 21s
	2h 39m 58s

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