Merge pull request #15745 from ecology-chris/sponsor_upgrade

[ATL-2026] upgrading cleanstart

Author: toshywoshy

data/events/2026/atlanta/main.yml

@@ -120,7 +120,7 @@ sponsors:
   - id: ibm
     level: gold
   - id: cleanstart
-    level: silver
+    level: gold
   - id: arresteddevops
     level: community