build(deps): bump mini-css-extract-plugin from 2.8.0 to 2.9.1

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.8.0 to 2.9.1.
- [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@v2.8.0...v2.9.1)

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

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

package.json

@@ -134,7 +134,7 @@
     "lightningcss": "^1.26.0",
     "lodash": "^4.17.19",
     "marked": "6.0.0",
-    "mini-css-extract-plugin": "^2.8.0",
+    "mini-css-extract-plugin": "^2.9.1",
     "mobx": "^6.8.0",
     "mobx-react": "~7.6.0",
     "mockdate": "3.0.5",

yarn.lock

@@ -9149,10 +9149,10 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
-mini-css-extract-plugin@*, mini-css-extract-plugin@^2.8.0:
-  version "2.8.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.8.0.tgz#1aeae2a90a954b6426c9e8311eab36b450f553a0"
-  integrity sha512-CxmUYPFcTgET1zImteG/LZOy/4T5rTojesQXkSNBiquhydn78tfbCE9sjIjnJ/UcjNjOC1bphTCCW5rrS7cXAg==
+mini-css-extract-plugin@*, mini-css-extract-plugin@^2.9.1:
+  version "2.9.1"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.9.1.tgz#4d184f12ce90582e983ccef0f6f9db637b4be758"
+  integrity sha512-+Vyi+GCCOHnrJ2VPS+6aPoXN2k2jgUzDRhTFLjjTBn23qyXJXkjUWQgTL+mXpF5/A8ixLdCc6kWsoeOjKGejKQ==
   dependencies:
     schema-utils "^4.0.0"
     tapable "^2.2.1"