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Update env-checks.yml #41

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Run time

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Job	Run time
Python 3.7, macos-latest	38s
Python 3.8, macos-latest	2m 4s
Python 3.9, macos-latest	1m 42s
Python 3.7, ubuntu-latest	1m 27s
Python 3.8, ubuntu-latest	1m 40s
Python 3.9, ubuntu-latest	1m 44s
Python 3.7, windows-latest	6m 4s
Python 3.8, windows-latest	4m 10s
Python 3.9, windows-latest	5m 50s
	25m 19s