Curl_close: call Curl_resolver_cancel to avoid memory-leak

There might be a pending (c-ares) resolve that isn't free'd up yet.

Closes #9310

lib/url.c

@@ -440,6 +440,7 @@ CURLcode Curl_close(struct Curl_easy **datap)
   Curl_safefree(data->info.wouldredirect);
 
   /* this destroys the channel and we cannot use it anymore after this */
+  Curl_resolver_cancel(data);
   Curl_resolver_cleanup(data->state.async.resolver);
 
   Curl_http2_cleanup_dependencies(data);