update a forgotten result file

mysql-test/suite/gcol/r/innodb_virtual_debug_purge.result

@@ -80,7 +80,7 @@ SET DEBUG_SYNC= 'now WAIT_FOR uncommitted';
 # enable purge
 COMMIT;
 # wait for purge to process the deleted records.
-Timeout in wait_innodb_all_purged.inc for INNODB_PURGE_TRX_ID_AGE = 3
+Timeout in wait_innodb_all_purged.inc for INNODB_PURGE_TRX_ID_AGE = 4
 SET DEBUG_SYNC= 'now SIGNAL purged';
 connection default;
 /* connection default */ ALTER TABLE t1 ADD COLUMN c INT GENERATED ALWAYS AS(a+b), ADD INDEX idx (c), ALGORITHM=INPLACE, LOCK=SHARED;