Increased max number of EB app versions to allow rollback further in …

…history

api/aws_infra/cdk_classes/application_stack.py

@@ -35,7 +35,7 @@ def __init__(self, scope: Construct, construct_id: str, **kwargs: Any) -> None:
                 enabled=True,
                 # max_count = number of application versions to retain, BEFORE new env creation.
                 # Total will be max_count+1 after update completed.
-                max_count=2))
+                max_count=20))
 
         # Create EB application
         self.eb_application = eb.CfnApplication(