Update dev-dependencies

Author: wooorm

package.json

@@ -43,7 +43,7 @@
     "@types/w3c-xmlserializer": "^2.0.0",
     "c8": "^7.0.0",
     "hastscript": "^7.0.0",
-    "jsdom": "^20.0.0",
+    "jsdom": "^21.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^11.0.0",
     "remark-preset-wooorm": "^9.0.0",