Bump postcss from 8.4.17 to 8.4.25 (#1590)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.17 to 8.4.25.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.17...8.4.25)

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

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

package.json

@@ -96,7 +96,7 @@
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-react": "^7.31.1",
     "json-loader": "^0.5.7",
-    "postcss": "^8.4.17",
+    "postcss": "^8.4.25",
     "postcss-cli": "^9.1.0",
     "postcss-custom-properties": "^12.1.9",
     "postcss-custom-selectors": "^6.0.3",