chore(deps): bump postcss from 8.5.12 to 8.5.23 in /web

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.12 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@8.5.12...8.5.23)

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

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

Author: dependabot[bot]

web/package-lock.json

@@ -78,7 +78,7 @@
     "met-formio": "^1.0.16-rc.2",
     "mini-css-extract-plugin": "^2.4.5",
     "mui-sx": "^1.0.0",
-    "postcss": "^8.5.12",
+    "postcss": "^8.5.23",
     "postcss-flexbugs-fixes": "^5.0.2",
     "postcss-loader": "^8.2.0",
     "postcss-normalize": "^13.0.1",