build(deps-dev): bump mini-css-extract-plugin in /html (#610)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.3.7 to 1.3.8.
- [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](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v1.3.7...v1.3.8)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

html/package.json

@@ -44,7 +44,7 @@
     "html-webpack-plugin": "^4.5.1",
     "husky": "^5.0.9",
     "lint-staged": "^10.5.4",
-    "mini-css-extract-plugin": "^1.3.7",
+    "mini-css-extract-plugin": "^1.3.8",
     "node-sass": "^5.0.0",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "sass-loader": "^10.1.1",