bump agent version (#19)

Author: joshsny

package.json

@@ -59,7 +59,7 @@
     "yaml": "^2.8.1"
   },
   "dependencies": {
-    "@posthog/agent": "^1.3.1",
+    "@posthog/agent": "^1.4.0",
     "@radix-ui/react-icons": "^1.3.2",
     "@radix-ui/themes": "^3.2.1",
     "@tanstack/react-query": "^5.90.2",