Update dependency @nomiclabs/hardhat-etherscan to v3.1.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@nomiclabs/hardhat-etherscan (source)	3.1.4 → 3.1.8

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Release Notes

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

v3.1.8

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v3.1.7: @​nomiclabs/hardhat-etherscan v3.1.7

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This version of hardhat-etherscan improves how already verified contracts are handled. In previous versions, verification would be attempted and an error would be returned by the server. Starting from this version, the plugin will detect that the contract is already verified and show a message informing the user about this. Thanks @​OptimusOpus for working on this!

Besides that, this version adds support for Gnosis Chain's Chiado testnet.

v3.1.6

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Changes

• 070abb7: Added support for the http_proxy environment variable. When this variable is set, hardhat-etherscan will use the given proxy to send the verification requests.

v3.1.5: @​nomiclabs/hardhat-etherscan v3.1.5

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This release upgrades the version of undici used by the hardhat-etherscan plugin.

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