fix(deps): update dependency yargs to v12 (#103)

Author: renovate[bot]

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

@@ -16,7 +16,7 @@
     "async": "^2.6.1",
     "natural": "^0.6.1",
     "redis": "^2.8.0",
-    "yargs": "^11.0.0"
+    "yargs": "^12.0.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.3.0",