Merge pull request #15485 from baldwinjim/dfw2025-september-16-updates

[DFW-2025] Add gold sponsor peoplecert

Author: toshywoshy

data/events/2025/dallas/main.yml

@@ -184,6 +184,8 @@ sponsors:
     level: gold
   - id: cockroachlabs
     level: gold
+  - id: peoplecert
+    level: gold
   - id: pulumi
     level: silver
   - id: coder