chore(deps): update dependency jsdom to v21

Author: renovate[bot]

package.json

@@ -56,7 +56,7 @@
     "eslint-plugin-svelte3": "4.0.0",
     "fathom-client": "^3.5.0",
     "husky": "8.0.3",
-    "jsdom": "^20.0.3",
+    "jsdom": "^21.0.0",
     "mdsvex": "0.10.6",
     "postcss": "8.4.20",
     "postcss-load-config": "4.0.1",