chore: bump stylus from 0.59.0 to 0.60.0 (docsifyjs#2208)

Bumps [stylus](https://github.com/stylus/stylus) from 0.59.0 to 0.60.0.
- [Release notes](https://github.com/stylus/stylus/releases)
- [Changelog](https://github.com/stylus/stylus/blob/dev/Changelog.md)
- [Commits](stylus/stylus@0.59.0...0.60.0)

---
updated-dependencies:
- dependency-name: stylus
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Koy <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -112,7 +112,7 @@
     "rimraf": "^3.0.0",
     "rollup": "^3.25.3",
     "serve-handler": "^6.1.2",
-    "stylus": "^0.59.0",
+    "stylus": "^0.60.0",
     "vue2": "npm:vue@^2.6.12",
     "vue3": "npm:vue@^3.0.0",
     "xhr-mock": "^2.5.1"