Bump postcss from 8.5.1 to 8.5.3

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](https://github.com/postcss/postcss/compare/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>

package.json

@@ -134,7 +134,7 @@
     "i18next-parser": "^9.1.0",
     "istanbul": "^0.4.5",
     "istanbul-lib-coverage": "^3.2.2",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.3",
     "react-hot-loader": "^4.13.1",
     "sass": "^1.83.4",
     "stylelint": "^16.14.1",