build(deps-dev): bump postcss from 8.5.6 to 8.5.23 (#2044)

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.6 to 8.5.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.6...8.5.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.23
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package.json

@@ -116,7 +116,7 @@
     "nock": "^14.0.10",
     "node-red": "^4.1.3",
     "node-red-node-test-helper": "^0.3.6",
-    "postcss": "^8.5.6",
+    "postcss": "^8.5.23",
     "prettier": "^3.9.6",
     "sass": "^1.97.3",
     "typescript": "^5.9.3",