[Snyk] Upgrade @nomiclabs/hardhat-etherscan from 3.0.1 to 3.1.0#4

snyk-bot wants to merge 1 commit intomasteragentjacker/tokenbridge:masterfrom

snyk-upgrade-74a8cbac0a21f307782fc524a95bd04bagentjacker/tokenbridge:snyk-upgrade-74a8cbac0a21f307782fc524a95bd04bCopy head branch name to clipboard