LibJS: Port create_temporal_time_zone() to String

Author: https://github.com/linusg
Commit: 5a2dfc52f8
Pull-request: https://github.com/SerenityOS/serenity/pull/17186
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTime.cpp

@@ -221,7 +221,7 @@ ThrowCompletionOr<ZonedDateTime*> to_temporal_zoned_date_time(VM& vm, Value item
         }
 
         // j. Let timeZone be ! CreateTemporalTimeZone(timeZoneName).
-        time_zone = MUST(create_temporal_time_zone(vm, time_zone_name->to_deprecated_string()));
+        time_zone = MUST_OR_THROW_OOM(create_temporal_time_zone(vm, *time_zone_name));
 
         // k. Let calendar be ? ToTemporalCalendarWithISODefault(result.[[Calendar]]).
         auto temporal_calendar_like = result.calendar.has_value()