Bump postcss from 8.4.38 to 8.4.39 (#269)

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
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -41,7 +41,7 @@
     "escape-string-regexp": "^5.0.0",
     "glob": "^7.2.3",
     "picocolors": "^1.0.1",
-    "postcss": "^8.4.38",
+    "postcss": "^8.4.39",
     "postcss-scss": "^4.0.9",
     "strip-bom": "^5.0.0"
   },