Bump mini-css-extract-plugin from 1.6.2 to 2.6.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.6.2 to 2.6.0.
- [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@v1.6.2...v2.6.0)

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

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

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
     "css-loader": "^5.0.0",
     "docsify": "^4.11.4",
     "lodash": "^4.17.20",
-    "mini-css-extract-plugin": "^1.2.1",
+    "mini-css-extract-plugin": "^2.6.0",
     "prismjs": "^1.27.0",
     "size-limit": "^4.7.0",
     "uuid": "^8.3.1",