Use DateUtils when deserialising timezones

DateUtils.of methods allows to emitt deprecation message when a
deprecated timezone was used

closes elastic#38449

server/src/main/java/org/elasticsearch/common/io/stream/StreamInput.java

@@ -884,7 +884,7 @@ public ZoneId readZoneId() throws IOException {
      */
     public ZoneId readOptionalZoneId() throws IOException {
         if (readBoolean()) {
-            return ZoneId.of(readString());
+            return DateUtils.of(readString());
         }
         return null;
     }