build(deps-dev): bump serve-static in /litemall-admin

Bumps [serve-static](https://github.com/expressjs/serve-static) from 1.13.2 to 1.16.0.
- [Release notes](https://github.com/expressjs/serve-static/releases)
- [Changelog](https://github.com/expressjs/serve-static/blob/master/HISTORY.md)
- [Commits](expressjs/serve-static@v1.13.2...1.16.0)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

litemall-admin/package.json

@@ -89,7 +89,7 @@
     "sass": "1.26.2",
     "sass-loader": "8.0.2",
     "script-ext-html-webpack-plugin": "2.1.3",
-    "serve-static": "1.13.2",
+    "serve-static": "1.16.0",
     "svg-sprite-loader": "4.1.3",
     "svgo": "1.2.0",
     "vue-template-compiler": "2.6.10"