chore(deps-dev): bump postcss from 8.4.27 to 8.4.31 in /frontend (#5640)

* chore(deps-dev): bump postcss from 8.4.27 to 8.4.31 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.27 to 8.4.31.
- [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/8.4.27...8.4.31)

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

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

* package-lock.json

---------

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

frontend/package.json

@@ -55,7 +55,7 @@
     "happy-dom": "13.4.1",
     "madge": "6.1.0",
     "normalize.css": "8.0.1",
-    "postcss": "8.4.27",
+    "postcss": "8.4.31",
     "sass": "1.70.0",
     "subset-font": "2.3.0",
     "typescript": "5.3.3",

package-lock.json

@@ -262,7 +262,7 @@
         "happy-dom": "13.4.1",
         "madge": "6.1.0",
         "normalize.css": "8.0.1",
-        "postcss": "8.4.27",
+        "postcss": "8.4.31",
         "sass": "1.70.0",
         "subset-font": "2.3.0",
         "typescript": "5.3.3",
@@ -23598,9 +23598,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.27",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.27.tgz",
-      "integrity": "sha512-gY/ACJtJPSmUFPDCHtX78+01fHa64FaU4zaaWfuh1MhGJISufJAH4cun6k/8fwsHYeK4UQmENQK+tRLCFJE8JQ==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "dev": true,
       "funding": [
         {