Unit tests

Bump codecov/codecov-action from 3.1.5 to 4.0.0 (#18) #579

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Run time

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Job	Run time
unit (macos-latest, ^1.19.0)	21s
unit (ubuntu-latest, ^1.19.0)	12s
unit (windows-latest, ^1.19.0)	1m 36s
	2m 9s