Bump mini-css-extract-plugin from 2.7.6 to 2.8.1

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.7.6 to 2.8.1.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/mini-css-extract-plugin@v2.7.6...v2.8.1)

---
updated-dependencies:
- dependency-name: mini-css-extract-plugin
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Diff for: package.json

@@ -30,7 +30,7 @@
     "css-loader": "6.10.0",
     "css-minimizer-webpack-plugin": "6.0.0",
     "html-minifier": "4.0.0",
-    "mini-css-extract-plugin": "2.7.6",
+    "mini-css-extract-plugin": "2.8.1",
     "postcss": "8.4.33",
     "postcss-loader": "8.1.0",
     "pug": "3.0.2",