ci: enable M1 runners for CI job #1701

Job	Run time
Build Echidna on ubuntu-20.04	21m 20s
Build Echidna on macos-latest	33m 22s
Build Echidna on macos-latest-xlarge	15m 36s
Build Echidna on windows-latest	27m 1s
Test with solc 0.4.25 on ubuntu-latest	3m 24s
Test with solc 0.5.7 on ubuntu-latest	3m 40s
Test with solc 0.6.12 on ubuntu-latest	3m 48s
Test with solc 0.7.5 on ubuntu-latest	4m 39s
Test with solc 0.4.25 on windows-latest	4m 24s
Test with solc 0.5.7 on windows-latest	4m 31s
Test with solc 0.6.12 on windows-latest	4m 31s
Test with solc 0.7.5 on windows-latest	5m 51s
	2h 12m 7s

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