Add support for newer Geth

[elopez]

geth does no longer support the --rpc argument since v1.10.9 (Sept 29, 2021 - relevant commit ethereum/go-ethereum@9a0df80) and it should be replaced with --http.

etheno/etheno/geth.py

Line 92 in 46e162e

base_args = ['/usr/bin/env', 'geth', '--nodiscover', '--rpc', '--rpcport', "%d" % self.port, '--networkid', "%d" % self.genesis['config']['chainId'], '--datadir', self.logger.to_log_path(self.datadir), '--mine', '--etherbase', format_hex_address(self.miner_account.address), f"--verbosity={verbosity}", '--minerthreads=1']

The current geth version is v1.10.14