use importlib.util.find_spec #1216

Job	Run time
Python 3.8 on ubuntu-latest	2m 2s
Python 3.8 on macos-latest	2m 42s
Python 3.8 on windows-latest	4m 13s
Python 3.9 on ubuntu-latest	2m 45s
Python 3.9 on macos-latest	2m 51s
Python 3.9 on windows-latest	4m 13s
Python 3.10 on ubuntu-latest	2m 3s
Python 3.10 on macos-latest	3m 5s
Python 3.10 on windows-latest	3m 14s
Python 3.11 on ubuntu-latest	2m 2s
Python 3.11 on macos-latest	3m 44s
Python 3.11 on windows-latest	3m 27s
Python pypy-3.7 on ubuntu-latest	3m 14s
Python pypy-3.7 on macos-latest	8m 2s
Python pypy-3.7 on windows-latest	6m 36s
Python 3.6 on ubuntu-20.04	1m 33s
Python 3.7 on ubuntu-20.04	1m 45s
	57m 31s

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