build(deps-dev): bump postcss from 8.4.27 to 8.4.31 in /frontend (#2749)

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
...

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

frontend/package-lock.json

@@ -43,7 +43,7 @@
         "eslint-plugin-prettier": "^5.0.0",
         "eslint-plugin-vue": "^9.16.1",
         "jsdom": "^22.1.0",
-        "postcss": "^8.4.27",
+        "postcss": "^8.4.31",
         "prettier": "^3.0.1",
         "terser": "^5.19.2",
         "vite": "^4.4.9",
@@ -4787,9 +4787,9 @@
       }
     },
     "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==",
       "funding": [
         {
           "type": "opencollective",

frontend/package.json

@@ -49,7 +49,7 @@
     "eslint-plugin-prettier": "^5.0.0",
     "eslint-plugin-vue": "^9.16.1",
     "jsdom": "^22.1.0",
-    "postcss": "^8.4.27",
+    "postcss": "^8.4.31",
     "prettier": "^3.0.1",
     "terser": "^5.19.2",
     "vite": "^4.4.9",