:chore: Upgrade next.js version

Author: wryonik

bun.lockb

@@ -40,7 +40,7 @@
     "immer": "^10.1.1",
     "lottie-web": "^5.12.2",
     "lucide-react": "^0.454.0",
-    "next": "^15.3.2",
+    "next": "^15.3.8",
     "next-themes": "^0.3.0",
     "postal-mime": "^2.3.2",
     "posthog-js": "^1.200.1",