fix(deps): update dependency readdirp to v4

Author: renovate[bot]

package-lock.json

@@ -31,7 +31,7 @@
     "json-schema": "^0.4.0",
     "mdast-builder": "1.1.1",
     "mdast-util-to-string": "4.0.0",
-    "readdirp": "3.6.0",
+    "readdirp": "4.0.1",
     "remark-gfm": "^4.0.0",
     "remark-parse": "11.0.0",
     "remark-stringify": "11.0.0",