remove unused code

Author: levon80999

tests/Operation/FindAndModifyFunctionalTest.php

@@ -6,7 +6,6 @@
 use MongoDB\Driver\Exception\CommandException;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Exception\Exception;
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\Model\BSONDocument;
 use MongoDB\Operation\FindAndModify;