Bump postcss from 8.4.18 to 8.4.19 (#6555)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.18 to 8.4.19.
- [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/8.4.18...8.4.19)

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

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

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

package.json

@@ -404,7 +404,7 @@
     "node-loader": "^2.0.0",
     "nodemon": "^2.0.20",
     "playwright": "^1.27.1",
-    "postcss": "^8.4.18",
+    "postcss": "^8.4.19",
     "postcss-loader": "^6.2.1",
     "query-string": "^7.1.1",
     "randomcolor": "^0.6.2",