fix(deps): update dependency @google-cloud/translate to v8 (#615)

Author: renovate-bot

background/function/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@google-cloud/firestore": "^5.0.0",
-    "@google-cloud/translate": "^7.0.0"
+    "@google-cloud/translate": "^8.0.0"
   },
   "devDependencies": {}
 }