fix(deps): update dependency symfony/console to v5 (GoogleCloudPlatform#1412)

Author: renovate-bot

dialogflow/composer.json

@@ -1,7 +1,7 @@
 {
     "require": {
         "google/cloud-dialogflow": "^0.21",
-        "symfony/console": "^3.1"
+        "symfony/console": "^5.0"
     },
     "autoload": {
         "files": [