fix(deps): update dependency yargs to v17 (#1866)

Author: renovate-bot

samples/package.json

@@ -17,7 +17,7 @@
     "@google-cloud/kms": "^3.0.0",
     "@google-cloud/precise-date": "^3.0.0",
     "@google-cloud/spanner": "^6.12.0",
-    "yargs": "^16.0.0"
+    "yargs": "^17.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",