chore(deps): update dependency remark-mdx-frontmatter to v5

Author: renovate[bot]

docs/package.json

@@ -63,7 +63,7 @@
     "rehype-slug": "6.0.0",
     "remark-directive": "3.0.0",
     "remark-frontmatter": "5.0.0",
-    "remark-mdx-frontmatter": "4.0.0",
+    "remark-mdx-frontmatter": "5.2.0",
     "typescript": "5.7.2",
     "unified": "11.0.5",
     "unist-util-visit": "5.0.0",