Remove unused imports.

Author: kinyoklion

lib/sdk/server/src/main/java/com/launchdarkly/sdk/server/integrations/TestDataV2.java

@@ -18,12 +18,10 @@
 import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.TimeUnit;
 import java.util.HashMap;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.function.BooleanSupplier;
 
 /**
  * A mechanism for providing dynamically updatable feature flag state as a {@link Synchronizer}