build(deps): 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:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -30,7 +30,7 @@
     "minimatch": "^9.0.5",
     "newrelic": "^11.21.0",
     "next": "^14.2.4",
-    "postcss": "8.4.38",
+    "postcss": "8.4.39",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "react-window": "^1.8.10",