add missing trailing new line

Author: ptravers

test/sql-server-cdc-old-syntax/alter-table-after-source.td

@@ -320,4 +320,4 @@ DROP TABLE drop_table;
 # Table is dropped
 # TODO: This should fail
 # ! SELECT * FROM drop_table;
-# regex:(table was dropped|incompatible schema change)
+# regex:(table was dropped|incompatible schema change)