Upgrade framework

vendor/symfony/http-kernel/CacheWarmer/CacheWarmerInterface.php

@@ -26,7 +26,7 @@ interface CacheWarmerInterface extends WarmableInterface
      * A warmer should return true if the cache can be
      * generated incrementally and on-demand.
      *
-     * @return bool true if the warmer is optional, false otherwise
+     * @return bool
      */
     public function isOptional();
 }