chore(deps-dev): bump postcss from 8.4.41 to 8.5.6

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.41 to 8.5.6.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.41...8.5.6)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -87,7 +87,7 @@
     "karma-jasmine": "~4.0.1",
     "karma-jasmine-html-reporter": "^1.7.0",
     "karma-remap-istanbul": "^0.6.0",
-    "postcss": "^8.4.31",
+    "postcss": "^8.5.6",
     "protractor": "~7.0.0",
     "react-is": "^16.13.1",
     "ts-node": "~8.10.2",