Fixed an issue where an object of type bytes is not JSON serializable when saving the data from the query tool.

web/pgadmin/utils/driver/psycopg2/connection.py

@@ -1987,6 +1987,8 @@ Failed to reset the connection to the server due to following error:
 
             if parameters:
                 mogrified_sql = cursor.mogrify(query, parameters)
+                if isinstance(mogrified_sql, bytes):
+                    mogrified_sql = mogrified_sql.decode(self.python_encoding)
                 return mogrified_sql
             else:
                 return query