build(deps-dev): bump vuepress-plugin-auto-catalog

Bumps [vuepress-plugin-auto-catalog](https://github.com/vuepress-theme-hope/vuepress-theme-hope/tree/HEAD/packages/auto-catalog) from 2.0.0-rc.16 to 2.0.0-rc.20.
- [Release notes](https://github.com/vuepress-theme-hope/vuepress-theme-hope/releases)
- [Changelog](https://github.com/vuepress-theme-hope/vuepress-theme-hope/blob/v2.0.0-rc.20/CHANGELOG.md)
- [Commits](https://github.com/vuepress-theme-hope/vuepress-theme-hope/commits/v2.0.0-rc.20/packages/auto-catalog)

---
updated-dependencies:
- dependency-name: vuepress-plugin-auto-catalog
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -27,7 +27,7 @@
     "mermaid": "^10.7.0",
     "vue": "^3.4.15",
     "vuepress": "2.0.0-rc.2",
-    "vuepress-plugin-auto-catalog": "2.0.0-rc.16",
+    "vuepress-plugin-auto-catalog": "2.0.0-rc.20",
     "vuepress-plugin-copy-code2": "2.0.0-rc.16",
     "vuepress-plugin-md-enhance": "2.0.0-rc.16",
     "vuepress-plugin-search-pro": "2.0.0-rc.16"