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Co-authored-by: gzeon <hng@offchainlabs.com>
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This PR updates the hardhat-verify package to v2.1.3, which uses Etherscan's API v2.
Etherscan's API v2 uses a single API URL for all supported networks, which includes Arbitrum One, Nova and Sepolia. Now within the request sent to the API, the chain id of the network is included. Only Etherescan's API keys are valid now (the ones obtained from network-specific explorers, like Arbiscan, are no valid anymore).
Also, hardhat-verify@v2.1.3 includes arbitrumSepolia in their predefined networks, so there's no need to add it as a custom network anymore.
Finally, verification in sourcify has been included in the configuration, and the internal documentation has been updated with the same format.