nix-bitcoin-0.0.33

#308 Update nixpkgs-unstable, bitcoind (@erikarvstedt)
#310 update nixpkgs-unstable (@nixbitcoin)

Highlights

• bitcoind: 0.20.1 -> 0.21.0
  There's a new option in nix-bitcoin that makes use of bitcoind's new support for gossiping v3 onion addresses.

  # Set this to accounce the onion service address to peers.
  # The onion service allows accepting incoming connections via Tor.
  # nix-bitcoin.onionServices.bitcoind.public = true;
  

  Before, your bitcoind wouldn't get random inbound connections even if it was listening. This should now change if the bitcoind.public option is turned on.
• clightning: 0.9.2 -> 0.9.3
• lnd: 0.11.0 -> 0.12.0