js: Remove DeprecatedString usage in load_json_impl()

Author: https://github.com/evansmal
Commit: cb3216cb45
Pull-request: https://github.com/SerenityOS/serenity/pull/17306
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/linusg

Userland/Utilities/js.cpp

@@ -352,7 +352,7 @@ static JS::ThrowCompletionOr<JS::Value> load_ini_impl(JS::VM& vm)
 
 static JS::ThrowCompletionOr<JS::Value> load_json_impl(JS::VM& vm)
 {
-    auto filename = TRY(vm.argument(0).to_deprecated_string(vm));
+    auto filename = TRY(vm.argument(0).to_string(vm));
     auto file_or_error = Core::Stream::File::open(filename, Core::Stream::OpenMode::Read);
     if (file_or_error.is_error())
         return vm.throw_completion<JS::Error>(DeprecatedString::formatted("Failed to open '{}': {}", filename, file_or_error.error()));