chore: release 4.2.1 (#346)

Author: release-please[bot]

translate/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@google-cloud/automl": "^1.0.0",
     "@google-cloud/text-to-speech": "^1.1.4",
-    "@google-cloud/translate": "^4.1.3",
+    "@google-cloud/translate": "^4.2.1",
     "@google-cloud/vision": "^1.2.0",
     "yargs": "^14.0.0"
   },