Update css-loader requirement from ^6.7.3 to ^6.8.1

Updates the requirements on [css-loader](https://github.com/webpack-contrib/css-loader) to permit the latest version.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v6.7.3...v6.8.1)

---
updated-dependencies:
- dependency-name: css-loader
  dependency-type: direct:development
...

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

package.json

@@ -45,7 +45,7 @@
     "@typescript-eslint/eslint-plugin": "^4.33.0",
     "@typescript-eslint/parser": "^4.33.0",
     "babel-loader": "^9.1.3",
-    "css-loader": "^6.7.3",
+    "css-loader": "^6.8.1",
     "css-minimizer-webpack-plugin": "^4.2.2",
     "eslint": "^7.32.0",
     "file-loader": "^6.2.0",