Bump postcss from 8.5.16 to 8.5.23 in /icons-font

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.16 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@8.5.16...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>

Author: dependabot[bot]

icons-font/package-lock.json

@@ -28,7 +28,7 @@
     "autoprefixer": "^10.5.2",
     "nodemon": "^3.1.14",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.5.16",
+    "postcss": "^8.5.23",
     "postcss-cli": "^11.0.1",
     "purgecss": "^8.0.0",
     "sass": "^1.101.0",