Bump css-loader from 5.2.5 to 5.2.6 (#7075)

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 5.2.5 to 5.2.6.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v5.2.5...v5.2.6)

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package.json

@@ -127,7 +127,7 @@
     "commander": "6.2.1",
     "concurrently": "^6.0.0",
     "cspell": "^5.5.1",
-    "css-loader": "^5.2.5",
+    "css-loader": "^5.2.6",
     "dotenv": "^8.2.0",
     "github-api": "^3.4.0",
     "graphql": "^15.4.0",