Add delays to make test case stable on old versions of Java

h2/src/test/org/h2/test/scripts/functions/timeanddate/current_timestamp.sql

@@ -32,12 +32,18 @@ CALL SLEEP(10);
 INSERT INTO TEST(T) VALUES (CURRENT_TIMESTAMP(9));
 > update count: 1
 
+CALL SLEEP(10);
+>> null
+
 COMMIT;
 > ok
 
 INSERT INTO TEST(T) VALUES (CURRENT_TIMESTAMP(9));
 > update count: 1
 
+CALL SLEEP(10);
+>> null
+
 COMMIT;
 > ok
 
@@ -65,6 +71,9 @@ CALL SLEEP(10);
 INSERT INTO TEST(T) VALUES (CURRENT_TIMESTAMP(9));
 > update count: 1
 
+CALL SLEEP(10);
+>> null
+
 COMMIT;
 > ok