build(deps): bump mkdirp from 0.5.1 to 0.5.6

Bumps [mkdirp](https://github.com/isaacs/node-mkdirp) from 0.5.1 to 0.5.6.
- [Changelog](https://github.com/isaacs/node-mkdirp/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-mkdirp@0.5.1...v0.5.6)

---
updated-dependencies:
- dependency-name: mkdirp
  dependency-version: 0.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -28,7 +28,7 @@
     "ejs": "2.6.2",
     "minimatch": "3.0.4",
     "minimist": "1.2.5",
-    "mkdirp": "0.5.1",
+    "mkdirp": "0.5.6",
     "sorted-object": "2.0.1"
   },
   "main": "bin/express-cli.js",