Bump postcss-loader from 6.2.0 to 6.2.1

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 6.2.0 to 6.2.1.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v6.2.0...v6.2.1)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -37,7 +37,7 @@
     "html-loader": "^3.0.1",
     "html-webpack-plugin": "^5.5.0",
     "postcss": "^8.3.11",
-    "postcss-loader": "^6.2.0",
+    "postcss-loader": "^6.2.1",
     "postcss-preset-env": "^7.1.0",
     "postcss-scss": "^4.0.2",
     "sass": "^1.45.2",