Mark advanced field in addon info as deprecated (#279)

* Mark advanced field in addon info as deprecated

* Update aiohasupervisor/models/addons.py

Co-authored-by: Stefan Agner <stefan@agner.ch>

* Fix indent

---------

Co-authored-by: Stefan Agner <stefan@agner.ch>

Author: mdegat01

aiohasupervisor/models/addons.py

@@ -117,7 +117,7 @@ class AddonStartup(StrEnum):
 class AddonInfoBaseFields(ABC):
     """AddonInfoBaseFields ABC type."""
 
-    advanced: bool
+    advanced: bool  # Deprecated since Supervisor 2026.03; always False.
     available: bool
     build: bool
     description: str