Update dependency friendsofsymfony/ckeditor-bundle to v2.8.0

Author: renovate[bot]

composer.json

@@ -21,7 +21,7 @@
         "doctrine/doctrine-fixtures-bundle": "4.1.1",
         "doctrine/doctrine-migrations-bundle": "3.4.3",
         "doctrine/orm": "3.5.8",
-        "friendsofsymfony/ckeditor-bundle": "2.7.1",
+        "friendsofsymfony/ckeditor-bundle": "2.8.0",
         "gedmo/doctrine-extensions": "3.22.0",
         "jaybizzle/crawler-detect": "1.3.7",
         "runroom-packages/basic-page-bundle": "0.20.0",