chore(deps): update dependency @nomiclabs/hardhat-etherscan to v3.1.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@nomiclabs/hardhat-etherscan (source)	3.1.7 -> 3.1.8

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Release Notes

nomiclabs/hardhat (@​nomiclabs/hardhat-etherscan)

### [`v3.1.8`](https://togithub.com/nomiclabs/hardhat/compare/@nomiclabs/hardhat-etherscan@3.1.7...cd60539cd7c36880b2c15c38e300d6e82a3b7d38) [Compare Source](https://togithub.com/nomiclabs/hardhat/compare/@nomiclabs/hardhat-etherscan@3.1.7...cd60539cd7c36880b2c15c38e300d6e82a3b7d38)

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Configuration

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[socket-security[bot]]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@nomiclabs/hardhat-etherscan@3.1.8	environment Transitive: network, unsafe	+5	2.04 MB	fvictorio

🚮 Removed packages: npm/@nomiclabs/hardhat-etherscan@3.1.7

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