Update system arch discovery method

src/gmc_con.erl

@@ -283,11 +283,13 @@ platform_dir() ->
             {unix, linux} ->
                 "linux_x86_64";
             {unix, darwin} ->
-                case erlang:system_info(system_architecture) of
+                case string:trim(os:cmd("uname -m")) of
-                    "aarch64-" ++ _ ->
+                    "arm64" ->
                         "mac_arm64";
+                    "x86_64" ->
+                        "mac_x86_64";
                     Other ->
-                        ok = log(info, "system_architecture: ~p", [Other]),
+                        ok = log(info, "uname -m: ~p", [Other]),
                         "mac_x86_64"
                 end;
             {win32, nt} ->