Skip modified compilation for namespaces if solc < 0.8.20 (#892) #977

Job	Run time
lint	1m 51s
tests (core)	1m 57s
coverage	9m 22s
tests (plugin-hardhat)	6m 11s
tests (plugin-truffle)	2m 18s
tests (plugin-defender-hardhat)	7m 23s
	29m 2s

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