Update src/a2a/server/tasks/database_push_notification_config_store.py

Author: holtskinner

src/a2a/server/tasks/database_push_notification_config_store.py

@@ -94,7 +94,7 @@ def __init__(
 
         if encryption_key:
             try:
-                from cryptography.fernet import Fernet
+                from cryptography.fernet import Fernet  # noqa: PLC0415
             except ImportError as e:
                 raise ImportError(
                     "DatabasePushNotificationConfigStore with encryption requires the 'cryptography' "