Remove phpcs:ignore comments for unused use statements (#1086)

The line in DropEncryptedCollection was never necessary. The line in CreateEncryptedCollection may have been used at one point since Binary is only referenced in a psalm-var annotation, but phpcs no longer complains.

Author: jmikola

src/Operation/CreateEncryptedCollection.php

@@ -17,7 +17,6 @@
 
 namespace MongoDB\Operation;
 
-// phpcs:ignore SlevomatCodingStandard.Namespaces.UnusedUses.UnusedUse
 use MongoDB\BSON\Binary;
 use MongoDB\Driver\ClientEncryption;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;

src/Operation/DropEncryptedCollection.php

@@ -17,8 +17,6 @@
 
 namespace MongoDB\Operation;
 
-// phpcs:ignore SlevomatCodingStandard.Namespaces.UnusedUses.UnusedUse
-use MongoDB\BSON\Binary;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;