[stable-4.7] Bump postcss from 8.4.26 to 8.4.27 (#4099)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.26 to 8.4.27.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.26...8.4.27)

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

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

package.json

@@ -54,7 +54,7 @@
         "html-webpack-plugin": "^5.5.3",
         "monaco-editor-webpack-plugin": "^7.1.0",
         "npm-run-all": "^4.1.5",
-        "postcss": "^8.4.21",
+        "postcss": "^8.4.27",
         "prettier": "^2.8.8",
         "sass": "^1.64.2",
         "sass-loader": "^13.3.2",