build(deps-dev): bump postcss-loader from 8.0.0 to 8.1.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 8.0.0 to 8.1.0.
- [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@v8.0.0...v8.1.0)

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

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

packages/html-templates/package.json

@@ -54,7 +54,7 @@
     "lodash": "4.17.21",
     "mini-css-extract-plugin": "2.7.7",
     "postcss": "8.4.33",
-    "postcss-loader": "8.0.0",
+    "postcss-loader": "8.1.0",
     "preact": "10.19.3",
     "prop-types": "15.8.1",
     "react": "18.2.0",