fix(deps): update nextjs monorepo to v16

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "@tailwindcss/typography": "^0.5.12",
     "classnames": "^2.3.1",
     "gray-matter": "^4.0.3",
-    "next": "^15.1.4",
+    "next": "^16.0.0",
     "next-mdx-remote": "^5.0.0",
     "next-remote-watch": "2.0.0",
     "prismjs": "^1.29.0",
@@ -40,7 +40,7 @@
     "@stackbit/types": "^2.0.1",
     "@tailwindcss/postcss": "^4.0.16",
     "eslint": "^8.57.0",
-    "eslint-config-next": "^15.1.4",
+    "eslint-config-next": "^16.0.0",
     "eslint-config-prettier": "^9.1.0",
     "postcss": "^8.4.38",
     "tailwindcss": "^4.0.16",