Bump DeterminateSystems/nix-installer-action from 14 to 15 #2086

Job	Run time
Build Echidna on ubuntu-20.04	23m 32s
Build Echidna on macos-13	33m 41s
Build Echidna on windows-latest	30m 39s
Test with solc 0.4.25 on ubuntu-latest	3m 9s
Test with solc 0.5.7 on ubuntu-latest	3m 43s
Test with solc 0.6.12 on ubuntu-latest	3m 35s
Test with solc 0.7.5 on ubuntu-latest	4m 5s
Test with solc 0.4.25 on windows-latest	4m 8s
Test with solc 0.5.7 on windows-latest	5m 5s
Test with solc 0.6.12 on windows-latest	5m 47s
Test with solc 0.7.5 on windows-latest	4m 19s
	2h 1m 43s

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