Update upmsync.yml

Author: andnoonesthere

.github/workflows/upmsync.yml

@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
 env:
   base: https://dl.google.com/games/registry/unity/com.google.firebase.app-check/com.google.firebase.app-check
-  version: 12.8.0
+  version: 12.9.0
 jobs:
   build:
     runs-on: ubuntu-latest