Correctly use doctrine/dbal v3+

Author: nicolas-grekas

Store/PdoStore.php

@@ -13,8 +13,8 @@
 
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\DBALException;
+use Doctrine\DBAL\Driver\Result;
 use Doctrine\DBAL\DriverManager;
-use Doctrine\DBAL\Result;
 use Doctrine\DBAL\Schema\Schema;
 use Symfony\Component\Lock\Exception\InvalidArgumentException;
 use Symfony\Component\Lock\Exception\InvalidTtlException;