Bump postcss from 8.4.38 to 8.4.39 in /maxgui/workspace/package

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>

maxgui/workspace/package/package.json

@@ -31,7 +31,7 @@
         "@rollup/plugin-node-resolve": "~9.0.0",
         "@rollup/plugin-replace": "~2.4.2",
         "cross-env": "~7.0.3",
-        "postcss": "~8.4.38",
+        "postcss": "~8.4.39",
         "rimraf": "~3.0.2",
         "rollup": "~2.79.1",
         "rollup-plugin-copy": "~3.4.0",