update coarse-graining-workshop version to 2025-12-29

Author: jimboid

workshop.json

@@ -64,7 +64,7 @@
       "latest": "2025-12-22"
     },
     "coarse-graining-workshop": {
-      "latest": "2025-12-22"
+      "latest": "2025-12-29"
     }
   }
 }