Update endpoints for new liquid mainnet backend

The liquid mainnet backend server has migrated. There are secure
redirects in place for old clients but new clients should connect
directly to the new endpoints.

src/network_parameters.cpp

@@ -155,6 +155,12 @@ static std::vector<std::string> wamp_cert_pins = {
     // not before: Fri Sep  4 00:00:00 2020
     // not after: Mon Sep 15 16:00:00 2025
     "67add1166b020ae61b8f5fc96813c04c2aa589960796865572a3c7e737613dfd",
+
+    // subject: 'C=US, O=Google Trust Services LLC, CN=GTS CA 1D4'
+    // issuer: 'C=US, O=Google Trust Services LLC, CN=GTS Root R1'
+    // not before: 'Aug 13 00:00:42 2020 GMT'
+    // not after: 'Sep 30 00:00:42 2027 GMT'
+    "64e286b76063602a372efd60cde8db2656a49ee15e84254b3d6eb5fe38f4288b",
 };
 
 static std::map<std::string, std::shared_ptr<nlohmann::json>> registered_networks = {
@@ -229,8 +235,8 @@ static std::map<std::string, std::shared_ptr<nlohmann::json>> registered_network
             { "tx_explorer_url", "https://blockstream.info/liquid/tx/" },
             { "wamp_cert_pins", wamp_cert_pins },
             { "wamp_cert_roots", wamp_cert_roots },
-            { "wamp_onion_url", "ws://liquidbtc7u746j4.onion/v2/ws" },
-            { "wamp_url", "wss://liquidwss.greenaddress.it/v2/ws" }
+            { "wamp_onion_url", "ws://liquidbtcgecscpokecnr5uwg2de55shdq7dnvlpzeju7tnefbekicqd.onion/v2/ws" },
+            { "wamp_url", "wss://green-liquid-mainnet.blockstream.com/v2/ws" }
         })) },
 
     { "localtest-liquid",