Use CreateTemporalZonedDateTime when internally creating instances of ZDT

This is what we do at most other call sites, there was just one where we
called the constructor directly. It is marginally better
performance-wise, as it skips the checks for converting external bigint
values to JSBI.

Author: ptomato

lib/zoneddatetime.ts

@@ -435,7 +435,9 @@ export class ZonedDateTime implements Temporal.ZonedDateTime {
       direction === 'next'
         ? ES.GetNamedTimeZoneNextTransition(timeZone, thisEpochNanoseconds)
         : ES.GetNamedTimeZonePreviousTransition(timeZone, thisEpochNanoseconds);
-    return epochNanoseconds === null ? null : new ZonedDateTime(epochNanoseconds, timeZone, GetSlot(this, CALENDAR));
+    return epochNanoseconds === null
+      ? null
+      : ES.CreateTemporalZonedDateTime(epochNanoseconds, timeZone, GetSlot(this, CALENDAR));
   }
   toInstant(): Return['toInstant'] {
     ES.CheckReceiver(this, ES.IsTemporalZonedDateTime);