chore(deps-dev): bump postcss-loader from 4.2.0 to 4.3.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 4.2.0 to 4.3.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/v4.3.0/CHANGELOG.md)
- [Commits](webpack-contrib/postcss-loader@v4.2.0...v4.3.0)

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

package.json

@@ -157,7 +157,7 @@
     "oauth2-server": "^2.4.1",
     "open": "^8.0.8",
     "postcss": "=8.2.15",
-    "postcss-loader": "=4.2.0",
+    "postcss-loader": "=4.3.0",
     "postcss-preset-env": "=6.7.0",
     "prettier": "^2.3.0",
     "raw-loader": "^4.0.0",