Remove unused use statement

Author: jmikola

src/GridFS/Bucket.php

@@ -9,7 +9,6 @@
 use MongoDB\Driver\WriteConcern;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
-use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\GridFS\Exception\CorruptFileException;
 use MongoDB\GridFS\Exception\FileNotFoundException;
 use MongoDB\Operation\Find;