remove obsolete use statements

Author: dbu

src/Invalidation/AbstractCacheProxy.php

@@ -4,8 +4,6 @@
 
 use FOS\HttpCache\Exception\ExceptionCollection;
 use FOS\HttpCache\Exception\InvalidUrlException;
-use FOS\HttpCache\Exception\InvalidUrlPartsException;
-use FOS\HttpCache\Exception\InvalidUrlSchemeException;
 use FOS\HttpCache\Exception\ProxyResponseException;
 use FOS\HttpCache\Exception\ProxyUnreachableException;
 use Guzzle\Http\Client;