add stu to keynote

Author: spotz

src/content/gatherings/kubecon-25-nov-10/index.mdx

@@ -29,7 +29,7 @@ schedule:
     track: 'Main Stage'
     speakers:
       - id: 'amy_marrich'
-      - id: 'ju_lim'
+      - id: 'stu'
       - id: 'michael_foster'
   - local_time: '08:45'
     session_name: 'From Chaos to Control: Securing Red Hat OpenShift at Scale with Automation and Governance'