deps: Update dependency next to v15.4.7 [SECURITY]

Author: renovate[bot]

package.json

@@ -31,7 +31,7 @@
     "cloudinary": "^2.5.1",
     "eslint": "8.57.1",
     "eslint-config-next": "15.3.1",
-    "next": "15.3.1",
+    "next": "15.4.7",
     "next-auth": "^5.0.0-beta.25",
     "next-cloudinary": "^6.16.0",
     "react": "19.0.0",