build: fix mac build error of c-ares under GN

PR-URL: #53687
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

deps/cares/unofficial.gni

@@ -62,7 +62,7 @@ template("cares_gn_build") {
       sources += [ "config/linux/ares_config.h" ]
     }
     if (is_mac) {
-      sources += [ "config/darwin/ares_config.h" ]
+      sources += gypi_values.cares_sources_mac
     }
 
     if (is_clang || !is_win) {