Update dependency next to v14 [SECURITY]

Author: renovate[bot]

package.json

@@ -23,7 +23,7 @@
     "gray-matter": "4.0.3",
     "image-size": "1.1.1",
     "mdx-bundler": "9.2.1",
-    "next": "12.3.4",
+    "next": "14.2.7",
     "next-plugin-preact": "3.0.7",
     "next-sitemap": "4.2.3",
     "next-themes": "0.3.0",