Bump postcss from 8.4.38 to 8.4.48

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.38 to 8.4.48.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.38...8.4.48)

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

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

package.json

@@ -70,7 +70,7 @@
     "normalise": "^10.0.0",
     "normalize.css": "^8.0.1",
     "null-loader": "^4.0.1",
-    "postcss": "^8.4.24",
+    "postcss": "^8.4.48",
     "postcss-import": "^16.1.0",
     "postcss-loader": "^8.1.1",
     "postcss-preset-env": "^10.0.7",