Bump actions/setup-python from 4 to 5 (#1147) #1726

Job	Run time
Build Echidna on ubuntu-20.04	3m 58s
Build Echidna on macos-latest	2m 28s
Build Echidna on windows-latest	12m 14s
Test with solc 0.4.25 on ubuntu-latest	3m 46s
Test with solc 0.5.7 on ubuntu-latest	3m 52s
Test with solc 0.6.12 on ubuntu-latest	3m 34s
Test with solc 0.7.5 on ubuntu-latest	4m 36s
Test with solc 0.4.25 on windows-latest	4m 59s
Test with solc 0.5.7 on windows-latest	5m 5s
Test with solc 0.6.12 on windows-latest	5m 28s
Test with solc 0.7.5 on windows-latest	5m 40s
	55m 40s

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