Bump cachix/install-nix-action from 22 to 23 #1615

Job	Run time
Build Echidna on ubuntu-20.04	4m 19s
Build Echidna on macos-latest	4m 18s
Build Echidna on windows-latest	12m 57s
Test with solc 0.4.25 on ubuntu-latest	3m 59s
Test with solc 0.5.7 on ubuntu-latest	4m 32s
Test with solc 0.6.12 on ubuntu-latest	4m 6s
Test with solc 0.7.5 on ubuntu-latest	5m 29s
Test with solc 0.4.25 on windows-latest	5m 35s
Test with solc 0.5.7 on windows-latest	6m 8s
Test with solc 0.6.12 on windows-latest	7m 56s
Test with solc 0.7.5 on windows-latest	6m 51s
	1h 6m 10s

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