src: remove unused includes from main thread

PR-URL: #46471
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/inspector/main_thread_interface.cc

@@ -1,13 +1,9 @@
 #include "main_thread_interface.h"
 
 #include "env-inl.h"
-#include "node_mutex.h"
 #include "simdutf.h"
-#include "util-inl.h"
 #include "v8-inspector.h"
 
-#include <unicode/unistr.h>
-
 #include <functional>
 #include <memory>