src: remove unused 'ares.h' include from env.h

PR-URL: #19557
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>

Author: addaleax

src/env.h

@@ -25,7 +25,6 @@
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #include "aliased_buffer.h"
-#include "ares.h"
 #if HAVE_INSPECTOR
 #include "inspector_agent.h"
 #endif