fix(deps): update dependency yargs to v17

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",