Bump mini-css-extract-plugin from 2.8.1 to 2.9.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.8.1 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](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v2.8.1...v2.9.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

yarn.lock

@@ -3025,7 +3025,7 @@ __metadata:
     jquery-ujs: "npm:^1.2.3"
     jstree: "npm:^3.3.16"
     keycharm: "npm:^0.4.0"
-    mini-css-extract-plugin: "npm:^2.8.1"
+    mini-css-extract-plugin: "npm:^2.9.0"
     moment: "npm:^2.30.1"
     opensans-webkit: "npm:^1.1.0"
     pnp-webpack-plugin: "npm:^1.7.0"
@@ -5410,15 +5410,15 @@ __metadata:
   languageName: node
   linkType: hard
 
-"mini-css-extract-plugin@npm:^2.8.1":
-  version: 2.8.1
-  resolution: "mini-css-extract-plugin@npm:2.8.1"
+"mini-css-extract-plugin@npm:^2.9.0":
+  version: 2.9.0
+  resolution: "mini-css-extract-plugin@npm:2.9.0"
   dependencies:
     schema-utils: "npm:^4.0.0"
     tapable: "npm:^2.2.1"
   peerDependencies:
     webpack: ^5.0.0
-  checksum: ef0064f32051294e76141ba74ddf139d313ba26f3abcef1a3906347ca75df8e69c490351bd4c2f373b0cf5c934f39c7d643c8615421c24e4d2c724345294f80a
+  checksum: 46e20747ea250420db8a82801b9779299ce3cd5ec4d6dd75e00904c39cc80f0f01decaa534b8cb9658d7d3b656b919cb2cc84b1ba7e2394d2d6548578a5c2901
   languageName: node
   linkType: hard