Bump mini-css-extract-plugin from 2.5.3 to 2.6.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 2.5.3 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](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v2.5.3...v2.6.0)

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

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

package.json

@@ -175,7 +175,7 @@
     "jsdom": "^19.0.0",
     "json-loader": "^0.5.7",
     "listr": "^0.14.3",
-    "mini-css-extract-plugin": "^2.5.3",
+    "mini-css-extract-plugin": "^2.6.0",
     "node-loader": "^2.0.0",
     "node-sass": "^7.0.1",
     "postcss": "^8.4.6",

yarn.lock

@@ -8407,10 +8407,10 @@ 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@^2.5.3:
-  version "2.5.3"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.5.3.tgz#c5c79f9b22ce9b4f164e9492267358dbe35376d9"
-  integrity sha512-YseMB8cs8U/KCaAGQoqYmfUuhhGW0a9p9XvWXrxVOkE3/IiISTLw4ALNt7JR5B2eYauFM+PQGSbXMDmVbR7Tfw==
+mini-css-extract-plugin@^2.6.0:
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.6.0.tgz#578aebc7fc14d32c0ad304c2c34f08af44673f5e"
+  integrity sha512-ndG8nxCEnAemsg4FSgS+yNyHKgkTB4nPKqCOgh65j3/30qqC5RaSQQXMm++Y6sb6E1zRSxPkztj9fqxhS1Eo6w==
   dependencies:
     schema-utils "^4.0.0"