Updated heartbeat packet value to VLQ, since it isn't actually transmitted as a UBInt64, contrary to what the Dev docs say.

Author: kharidiron

packets/packet_types.py

@@ -422,5 +422,5 @@ def _decode(self, obj, context):
         properties=[Container(key=k, value=Container(type="SVLQ", data=v)) for k, v in dictionary.items()]))
 
 # (53) - Heartbeat
-heartbeat = lambda name="heartbeat": Structure(name,
-                                               UBInt64("remote_step"))
+heartbeat = lambda name="heartbeat": Struct(name,
+                                            VLQ("remote_step"))