fix(deps): update dependency next to v15.4.7 [security]

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "@react-email/components": "0.5.7",
-    "next": "15.3.5",
+    "next": "15.4.7",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "resend": "latest"