Add flox as a sponsor

Author: dgrizzanti

data/events/2025/philadelphia/main.yml

@@ -90,6 +90,9 @@ sponsors:
   # - id: samplesponsorname
   # level: gold
   #  url: http://mysponsor.com/?campaign=me # Use this if you need to over-ride a sponsor URL.
+  - id: flox
+    level: gold
+    url: https://flox.dev/
   - id: kubeevents
     level: community
     url: https://kube.events