Bump postcss from 8.5.1 to 8.5.3 in /client

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.1 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@8.5.1...8.5.3)

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

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

Author: dependabot[bot]

client/package-lock.json

@@ -51,7 +51,7 @@
         "husky": "^9.1.7",
         "jsdom": "^25.0.1",
         "msw": "^2.3.1",
-        "postcss": "^8.5.1",
+        "postcss": "^8.5.3",
         "prettier": "^3.3.3",
         "prettier-plugin-organize-imports": "^4.1.0",
         "tailwindcss": "^3.4.17",