dep: bump postcss from 8.5.2 to 8.5.3

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.2 to 8.5.3.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.2...8.5.3)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "npm-run-all": "^4.1.5",
     "onoff": "github:PhotoboothProject/onoff#master",
     "photoswipe": "^5.4.4",
-    "postcss": "^8.5.2",
+    "postcss": "^8.5.3",
     "sass": "^1.85.0",
     "socket.io": "^4.8.1",
     "socket.io-client": "^4.8.1",