Merge pull request #14913 from Shoeler/shoeler/add_sponsor_last9

[CHI-2025] Adding last9 as gold sponsor

Author: toshywoshy

data/events/2025/chicago/main.yml

@@ -195,6 +195,8 @@ sponsors:
     level: gold
   - id: komodor
     level: gold
+  - id: last9
+    level: gold
   - id: fairwinds
     level: bronze
   - id: lightrun