chore(deps): update nextjs monorepo to v15

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
     "domelementtype": "2.3.0",
     "feed": "4.2.2",
     "html-react-parser": "5.1.18",
-    "next": "14.2.16",
+    "next": "15.0.2",
     "next-seo": "6.6.0",
     "p-limit": "6.1.0",
     "react": "18.3.1",
@@ -34,7 +34,7 @@
     "theme-ui": "0.16.2"
   },
   "devDependencies": {
-    "@next/eslint-plugin-next": "14.2.16",
+    "@next/eslint-plugin-next": "15.0.2",
     "@types/node": "20.17.4",
     "@types/react": "18.3.12",
     "@typescript-eslint/parser": "7.18.0",