Fix checkstyle error

Author: alcaeus

tests/SpecTests/Operation.php

@@ -20,7 +20,6 @@
 use function array_map;
 use function fclose;
 use function fopen;
-use function in_array;
 use function MongoDB\is_last_pipeline_operator_write;
 use function MongoDB\with_transaction;
 use function stream_get_contents;