Upgrade to latest version of GoQuorum

With the impending upstream merge of geth v1.10 there are a bunch of deprecated cli flags.

Both are currently supported in v.1.19 (GoQuorum v21.10) but with the next release of GoQuorum, these will be deprecated also.

https://blog.ethereum.org/2021/03/03/geth-v1-10-0/

Notable changes: 

    --minerthreads -> --miner.threads
    --rpcport -> rpc.port
...

