fix(idempotency): fix ruff formatting - remove trailing whitespace in base.py

Remove trailing whitespace on blank line between is_missing_idempotency_key
and _get_hashed_payload methods to pass ruff format check.

Part of #8090

Signed-off-by: hirenkumar-n-dholariya <hirenkumarnd@gmail.com>

Author: hirenkumar-n-dholariya

aws_lambda_powertools/utilities/idempotency/persistence/base.py

@@ -136,7 +136,7 @@ def is_missing_idempotency_key(data) -> bool:
         elif isinstance(data, (int, float, bool)):
             return False
         return not data
-        
+
     def _get_hashed_payload(self, data: dict[str, Any]) -> str:
         """
         Extract payload using validation key jmespath and return a hashed representation