Bump nanoid and webpack-serve

Bumps [nanoid](https://github.com/ai/nanoid) to 3.3.8 and updates ancestor dependency [webpack-serve](https://github.com/shellscape/webpack-serve). These dependencies need to be updated together.


Updates `nanoid` from 2.1.11 to 3.3.8
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](https://github.com/ai/nanoid/compare/2.1.11...3.3.8)

Updates `webpack-serve` from 3.2.0 to 4.0.0
- [Release notes](https://github.com/shellscape/webpack-serve/releases)
- [Commits](https://github.com/shellscape/webpack-serve/compare/v3.2.0...v4.0.0)

---
updated-dependencies:
- dependency-name: nanoid
  dependency-type: indirect
- dependency-name: webpack-serve
  dependency-type: direct:production
...

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

package.json

@@ -31,7 +31,7 @@
     "vuepress": "^1.9.10",
     "vuepress-plugin-container": "^2.1.4",
     "vuepress-plugin-tabs": "^0.3.0",
-    "webpack-serve": "^3.2.0"
+    "webpack-serve": "^4.0.0"
   },
   "overrides": {
     "vue": "=2.6.14",