[ATL-2025] Add new sponsors

Add Shadow-soft, Stateful and devops.com as Bronze sponsors

Author: ghoneycutt

data/events/2025/atlanta/main.yml

@@ -102,7 +102,12 @@ sponsors:
     level: gold
   - id: redmonk
     level: community
-
+  - id: shadow-soft
+    level: bronze
+  - id: devopsdotcom
+    level: bronze
+  - id: stateful
+    level: bronze
 
 sponsors_accepted : "yes" # Whether you want "Become a XXX Sponsor!" link