fix(deps): update dependency yargs to v13 (#187)

Author: renovate[bot]

packages/google-cloud-texttospeech/samples/package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@google-cloud/text-to-speech": "^0.5.0",
-    "yargs": "^12.0.0"
+    "yargs": "^13.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",