Bump symfony/css-selector from 4.4.8 to 4.4.9 (#385)

composer.lock

@@ -2445,7 +2445,7 @@
         },
         {
             "name": "symfony/css-selector",
-            "version": "v4.4.8",
+            "version": "v4.4.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/css-selector.git",