remove redundant timestamp conversion in ws serializer

freqtrade/rpc/api_server/ws/serializer.py

@@ -3,7 +3,7 @@ from abc import ABC, abstractmethod
 
 import orjson
 import rapidjson
-from pandas import DataFrame, Timestamp
+from pandas import DataFrame
 
 from freqtrade.misc import dataframe_to_json, json_to_dataframe
 from freqtrade.rpc.api_server.ws.proxy import WebSocketProxy
@@ -52,11 +52,6 @@ def _json_default(z):
             '__type__': 'dataframe',
             '__value__': dataframe_to_json(z)
         }
-    # Pandas returns a Timestamp object, we need to
-    # convert it to a timestamp int (with ms) for orjson
-    # to handle it
-    if isinstance(z, Timestamp):
-        return z.timestamp() * 1e3
     raise TypeError