Fix flake8 warnings

Author: MDUYN

investing_algorithm_framework/app/strategy.py

@@ -113,7 +113,6 @@ def __init__(
                 f"Interval not set for strategy instance {self.strategy_id}"
             )
 
-
         if stop_losses is not None:
             self.stop_losses = stop_losses
 

investing_algorithm_framework/infrastructure/services/aws/state_handler.py

@@ -1,6 +1,5 @@
 import os
 import logging
-import stat
 import boto3
 from botocore.exceptions import NoCredentialsError, PartialCredentialsError
 from investing_algorithm_framework.domain import OperationalException, \