review: fix imports

Author: dimas-b

service/common/src/testFixtures/java/org/apache/polaris/service/TestServices.java

@@ -26,7 +26,11 @@
 import java.security.Principal;
 import java.time.Clock;
 import java.time.Instant;
-import java.util.*;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
 import org.apache.polaris.core.PolarisCallContext;
 import org.apache.polaris.core.PolarisDiagnostics;
 import org.apache.polaris.core.auth.AuthenticatedPolarisPrincipal;