fix: demo/package.json & demo/package-lock.json to reduce vulnerabilities (#124)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-9634163

Co-authored-by: snyk-bot <[email protected]>

Author: ibrahimcesar

demo/package-lock.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "babel-plugin-prismjs": "^2.1.0",
-    "next": "14.2.25",
+    "next": "14.2.26",
     "prismjs": "^1.27.0",
     "react": "18.2.0",
     "react-dom": "18.2.0",