fix(deps): update dependency yargs to v12 (#101)

Author: renovate[bot]

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

@@ -15,7 +15,7 @@
     "@google-cloud/speech": "^1.5.0",
     "@google-cloud/storage": "^1.7.0",
     "node-record-lpcm16": "^0.3.0",
-    "yargs": "^11.0.0"
+    "yargs": "^12.0.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^2.3.0",