fix(deps): update nextjs monorepo to v15

Author: renovate[bot]

package.json

@@ -13,7 +13,7 @@
     "format": "prettier --write ."
   },
   "dependencies": {
-    "@next/bundle-analyzer": "^14.0.1",
+    "@next/bundle-analyzer": "^15.0.0",
     "@radix-ui/react-dropdown-menu": "^2.0.6",
     "clsx": "^2.0.0",
     "github-slugger": "^2.0.0",
@@ -36,7 +36,7 @@
     "autoprefixer": "^10.4.16",
     "contentlayer": "^0.3.4",
     "eslint": "^8.52.0",
-    "eslint-config-next": "^14.0.1",
+    "eslint-config-next": "^15.0.0",
     "eslint-config-prettier": "^9.0.0",
     "iconoir-react": "^7.0.0",
     "mdast-flatten-image-paragraphs": "^1.0.0",