fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-6032387
- https://snyk.io/vuln/SNYK-JS-NEXT-8186172
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692

package.json

@@ -10,7 +10,7 @@
     "start": "next start"
   },
   "dependencies": {
-    "next": "13.0.0",
+    "next": "14.2.7",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "react-reveal": "1.2.2",