Update nextjs monorepo to v15

Author: renovate[bot]

package.json

@@ -15,7 +15,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "^13.3.2",
+    "next": "^15.0.0",
     "next-themes": "^0.2.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
@@ -29,7 +29,7 @@
     "@types/react": "^18.2.0",
     "@types/webpack-env": "^1.18.5",
     "eslint": "^8.39.0",
-    "eslint-config-next": "13.3.2",
+    "eslint-config-next": "15.4.6",
     "jest": "^27.5.1",
     "raw-loader": "^4.0.2",
     "typescript": "^4.9.5"