Merge pull request #15496 from hlmuludiang/PHI-2025/pulumi-addition

[PHILADELPHIA-2025] Added Pulumi as sponsor

Author: toshywoshy

data/events/2025/philadelphia/main.yml

@@ -101,6 +101,8 @@ sponsors:
     level: silver
   - id: xorq-labs
     level: silver
+  - id: pulumi
+    level: silver
   - id: kubeevents
     level: community
     url: https://kube.events