chore(deps-dev): bump postcss from 8.4.1 to 8.4.5 (#4124)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.1 to 8.4.5.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.1...8.4.5)

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

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

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

package.json

@@ -145,7 +145,7 @@
     "node-sass-package-importer": "^5.3.2",
     "nodemon": "^2.0.15",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.4.1",
+    "postcss": "^8.4.5",
     "postcss-cli": "^8.3.1",
     "rollup": "^2.60.2",
     "stylelint": "^13.13.1",