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](webpack/mini-css-extract-plugin@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>

Author: dependabot[bot]

package-lock.json

@@ -31,7 +31,7 @@
 		"babel-core": "7.0.0-bridge.0",
 		"babel-loader": "^8.2.3",
 		"copy-webpack-plugin": "^6.0.4",
-		"mini-css-extract-plugin": "^2.5.3",
+		"mini-css-extract-plugin": "^2.6.0",
 		"react": "^16.4.2",
 		"react-dom": "^16.14.0",
 		"webpack": "^5.1.3",
@@ -52,6 +52,6 @@
 		"react-router-dom": "^4.2.2",
 		"react-sortable-hoc": "^0.8.3",
 		"style-loader": "^0.21.0",
-		"styled-jsx": "^2.2.6"
+		"styled-jsx": "^5.0.0"
 	}
 }