fix(deps): update dependency arg to v5 (#260)

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

Author: renovate[bot]

package-lock.json

@@ -35,7 +35,7 @@
   "dependencies": {
     "@cypress/browserify-preprocessor": "3.0.2",
     "@textlint/markdown-to-ast": "12.2.3",
-    "arg": "4.1.3",
+    "arg": "5.0.2",
     "common-tags": "1.8.2",
     "debug": "4.3.4",
     "safe-marked": "11.0.0",