fix(deps): update dependency yargs to v13 (#203)

Author: renovate[bot]

cloud-language/snippets/package.json

@@ -19,7 +19,7 @@
     "mathjs": "^5.1.0",
     "@google-cloud/language": "^2.0.1",
     "@google-cloud/storage": "^2.0.0",
-    "yargs": "^12.0.0"
+    "yargs": "^13.0.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",