Bump mini-css-extract-plugin from 2.3.0 to 2.9.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.3.0 to 2.9.0.
- [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/mini-css-extract-plugin@v2.3.0...v2.9.0)

---
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]

package-lock.json

@@ -164,7 +164,7 @@
     "is-ci": "3.0.0",
     "iti": "0.6.0",
     "lint-staged": "10.5.4",
-    "mini-css-extract-plugin": "2.3.0",
+    "mini-css-extract-plugin": "2.9.0",
     "moment": "2.29.4",
     "node-wp-i18n": "1.2.5",
     "postcss": "8.3.5",