fix(deps): update dependency yargs to v15 (#279)

Author: renovate-bot

automl/snippets/package.json

@@ -19,7 +19,7 @@
     "@google-cloud/automl": "^1.9.0",
     "csv": "^5.1.3",
     "mathjs": "^6.0.0",
-    "yargs": "^14.0.0"
+    "yargs": "^15.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",