Change clock supplier to use UTC time

Author: emmyzhou-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/utils/SystemClockSupplier.java

@@ -5,6 +5,6 @@
 public class SystemClockSupplier implements ClockSupplier {
   @Override
   public Clock getClock() {
-    return Clock.systemDefaultZone();
+    return Clock.systemUTC();
   }
 }