Lower versions of the plugin didn't support Etherscan verification of contracts
on Sepolia, resulting in error:
```
Network with chainId: 11155111 not supported. You can specify the url manually
via --api-url <url>.
```
As deploy of contracts on Sepolia is something we've recently added to the
config, we want to also be able to verify the deployed contracts, hence the need
for an upgrade of the plugin.