Replace Starscream with URLSessionWebSocketTask

Changelog-Fixed: Fix slow reconnection issues

damus/Nostr/Relay.swift

@@ -52,14 +52,12 @@ class Relay: Identifiable {
     let descriptor: RelayDescriptor
     let connection: RelayConnection
     
-    var last_pong: UInt32
     var flags: Int
     
     init(descriptor: RelayDescriptor, connection: RelayConnection) {
         self.flags = 0
         self.descriptor = descriptor
         self.connection = connection
-        self.last_pong = 0
     }
     
     func mark_broken() {