Bump mini-css-extract-plugin from 2.7.5 to 2.8.1

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.7.5 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@v2.7.5...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] <support@github.com>

package.json

@@ -74,7 +74,7 @@
         "jest-css-modules": "^2.1.0",
         "less": "^4.1.3",
         "less-loader": "^11.1.0",
-        "mini-css-extract-plugin": "^2.7.5",
+        "mini-css-extract-plugin": "^2.8.1",
         "postcss-loader": "^7.3.0",
         "prettier": "^2.8.8",
         "pretty-quick": "^3.1.3",