Bump cachix/cachix-action from 13 to 14 (#1162) #1756

Job	Run time
Build Echidna on ubuntu-20.04	3m 36s
Build Echidna on macos-latest	2m 48s
Build Echidna on windows-latest	9m 36s
Test with solc 0.4.25 on ubuntu-latest	3m 18s
Test with solc 0.5.7 on ubuntu-latest	3m 54s
Test with solc 0.6.12 on ubuntu-latest	3m 50s
Test with solc 0.7.5 on ubuntu-latest	4m 12s
Test with solc 0.4.25 on windows-latest	4m 40s
Test with solc 0.5.7 on windows-latest	5m 1s
Test with solc 0.6.12 on windows-latest	5m 7s
Test with solc 0.7.5 on windows-latest	6m 27s
	52m 29s

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