Change gas prices for mainnet

[fadeev]

Deployed (ZetaChain) and interacted with a swap contract (from Ethereum) on mainnet and these configs seemed to have worked for me. Perhaps, we should update the networks JSON to have them by default.

  networks: {
    ...getHardhatConfigNetworks(),
    eth_mainnet: {
      accounts: getHardhatConfigNetworks()["eth_mainnet"].accounts,
      chainId: 1,
      gas: 30000,
      gasPrice: 5000000000,
      url: "https://eth-mainnet.public.blastapi.io",
    },
    zeta_mainnet: {
      accounts: getHardhatConfigNetworks()["zeta_mainnet"].accounts,
      chainId: 7000,
      gas: 5000000,
      gasPrice: 10000000000,
      url: "https://zetachain-evm.blockpi.network:443/v1/rpc/public",
    },
  }

I also had to specify the gas limit when depositing.

    tx = await custodyContract.deposit(
      signer.address,
      args.token,
      value,
      data,
      { gasLimit: 150000 }
    );

    tx = await signer.sendTransaction({ data, to, value, gasLimit: 200000 });