Update Datetime Numeric Check

Changed to handle other pandas and numpy integer types such as int64.

lux/executor/PandasExecutor.py

@@ -488,7 +488,7 @@ def _is_datetime_string(series):
 
     @staticmethod
     def _is_datetime_number(series):
-        if series.dtype == int:
+        if series.dtype == int or "int" in str(series.dtype):
             try:
                 temp = series.astype(str)
                 pd.to_datetime(temp)