Update dependency next to v14.2.33 (#160)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: David Zhao <dz@livekit.io>

package.json

@@ -19,7 +19,7 @@
     "livekit-client": "^2.9.5",
     "livekit-server-sdk": "^2.13.0",
     "lodash": "^4.17.21",
-    "next": "^16.0.0",
+    "next": "^15.5.6",
     "next-plugin-preval": "^1.2.6",
     "qrcode.react": "^4.1.0",
     "react": "^19.0.0",
@@ -32,10 +32,10 @@
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
     "autoprefixer": "^10.4.20",
-    "eslint": "^8.57.1",
+    "eslint": "^9.0.0",
     "eslint-config-next": "16.0.5",
     "postcss": "^8.4.49",
-    "tailwindcss": "^4.0.0",
+    "tailwindcss": "^3.4.18",
     "typescript": "^5.7.2",
     "prettier": "^3.4.2"
   }