Removing unused import

Removig StreamFactory as it's not used.

Author: JimTools

src/Cache.php

@@ -15,7 +15,6 @@
 use Psr\Http\Server\MiddlewareInterface;
 use Psr\Http\Server\RequestHandlerInterface;
 
-use Slim\Psr7\Factory\StreamFactory;
 use function in_array;
 use function is_array;
 use function is_numeric;