chore(deps-dev): bump postcss-loader from 7.2.4 to 7.3.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 7.2.4 to 7.3.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/postcss-loader@v7.2.4...v7.3.0)

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

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

package.json

@@ -39,7 +39,7 @@
     "html-webpack-plugin": "^5.5.1",
     "mini-css-extract-plugin": "^2.7.2",
     "postcss": "^8.4.23",
-    "postcss-loader": "^7.2.4",
+    "postcss-loader": "^7.3.0",
     "prettier": "^2.8.5",
     "react-refresh": "^0.14.0",
     "rimraf": "^5.0.0",