Bump postcss from 8.5.2 to 8.5.3 (#761)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.2 to 8.5.3.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.2...8.5.3)

---
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>

Author: dependabot[bot]

package-lock.json

@@ -86,7 +86,7 @@
     "jest": "^29.7.0",
     "jest-axe": "^9.0.0",
     "jest-environment-jsdom": "^29.7.0",
-    "postcss": "^8.4.31",
+    "postcss": "^8.5.6",
     "stylelint": "^16.14.1",
     "stylelint-config-recommended": "^15.0.0",
     "stylelint-config-sass-guidelines": "^12.1.0",