[CHI-2025] Adding Atono Gold Sponsor (#14455)

[CHI-2025] Adding Atono Gold Sponsor

Author: albert-cheung

data/events/2025/chicago/main.yml

@@ -146,6 +146,8 @@ sponsors:
  #  url: http://mysponsor.com/?campaign=me # Use this if you need to over-ride a sponsor URL.
   - id: redhat
     level: platinum
+  - id: atono
+    level: gold
   - id: arresteddevops
     level: community