fix(deps): update dependency google/cloud-language to ^0.31.0 (GoogleCloudPlatform#1910)

Author: renovate-bot

language/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "google/cloud-language": "^0.30.2",
+        "google/cloud-language": "^0.31.0",
         "google/cloud-storage": "^1.20.1"
     }
 }