fix in upstream lib for filenames

utils/misc.py

@@ -29,10 +29,3 @@ def getattr_or(o: object, prop: str, default=None):
     except:
         return default
 
-
-class DateTimeEncoder(json.JSONEncoder):
-    # to allow json.dump with datetimes do json.dumps(obj, cls=DateTimeEncoder)
-    def default(self, o):
-        if isinstance(o, datetime):
-            return str(o)  # with timezone
-        return json.JSONEncoder.default(self, o)