deps: remove whatwg-url override

This commit removes the final override from the package.json file.
The whatwg-url override was added to silence Node core deprecation
warning DEP0040. While this silences the warning in the CI, it does
not help users of this module.

I have also opened nodejs/node#56632. If
landed, that will make the warning go away for users of this
library.

Author: cjihrig

package-lock.json

@@ -114,8 +114,5 @@
         "trailingComma": "all",
         "singleQuote": true,
         "arrowParens": "always"
-    },
-    "overrides": {
-        "whatwg-url@<12.0.1": "12.0.1"
     }
 }