Bump postcss from 8.4.38 to 8.4.39

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.38 to 8.4.39.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.38...8.4.39)

---
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

@@ -43,7 +43,7 @@
     "jquery": "3.7.1",
     "npm-run-all": "4.1.5",
     "popper.js": "1.16.1",
-    "postcss": "8.4.38",
+    "postcss": "8.4.39",
     "postcss-cli": "11.0.0",
     "prettier": "3.2.5",
     "stylelint": "16.6.0",