Fix PrometheusSinkServiceTest

Signed-off-by: Krishna Kondaka <krishkdk@amazon.com>

Author: kkondaka

data-prepper-plugins/prometheus-sink/src/test/java/org/opensearch/dataprepper/plugins/sink/prometheus/service/PrometheusSinkServiceTest.java

@@ -58,7 +58,7 @@ public class PrometheusSinkServiceTest {
             "          max_events: 2\n" +
             "          flush_interval: 10\n"+
             "        connection_timeout: 10\n"+
-            "        out_of_order_window: 0\n" +
+            "        out_of_order_time_window: 0\n" +
             "        idle_timeout: 10\n"+
             "        aws:\n" +
             "          region: \"us-east-2\"\n" +