Style: add blank lines between class definitions and attributes in annotated attribute example

Author: rmk135

examples/wiring/example_attribute_annotated.py

@@ -11,13 +11,15 @@ class Service:
 
 
 class Container(containers.DeclarativeContainer):
+
     service = providers.Factory(Service)
 
 
 service: Annotated[Service, Provide[Container.service]]
 
 
 class Main:
+
     service: Annotated[Service, Provide[Container.service]]