Update dev-dependencies

Author: wooorm

package.json

@@ -49,8 +49,8 @@
   },
   "devDependencies": {
     "@types/node": "^20.0.0",
-    "@types/ungap__structured-clone": "^0.3.0",
-    "c8": "^8.0.0",
+    "@types/ungap__structured-clone": "^1.0.0",
+    "c8": "^9.0.0",
     "hast-util-to-html": "^9.0.0",
     "hastscript": "^8.0.0",
     "mdast-util-from-markdown": "^2.0.0",