Update dependency yargs to v18 (#493)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -27,7 +27,7 @@
     "read-cache": "^1.0.0",
     "slash": "^5.0.0",
     "tinyglobby": "^0.2.12",
-    "yargs": "^17.0.0"
+    "yargs": "^18.0.0"
   },
   "devDependencies": {
     "ava": "^3.1.0",