Add youtube video to CaaS talk in madrid

Author: aaronj0

_data/preslist.yml

@@ -8,6 +8,7 @@
   speaker:  Aaron Jomy, Vipul Cariappa
   id: "USINGSTDCPP2026"
   artifacts: |
+    [Video](https://youtu.be/jMO5Usa26cg), 
     [Link to Slides](/assets/presentations/Aaron_Vipul_Compiler_as_a_Service_CXX_goes_Live.pdf)
   highlight: 1