build(deps-dev): bump postcss from 8.4.22 to 8.4.23 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.22 to 8.4.23.
- [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/8.4.22...8.4.23)

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

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

frontend/package-lock.json

@@ -45,7 +45,7 @@
         "eslint-config-prettier": "^8.8.0",
         "eslint-config-react-app": "^7.0.1",
         "eslint-plugin-prettier": "^4.2.1",
-        "postcss": "^8.4.22",
+        "postcss": "^8.4.23",
         "prettier": "^2.8.7",
         "react-test-renderer": "^18.2.0",
         "storybook": "^7.0.6",
@@ -13205,9 +13205,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.22",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.22.tgz",
-      "integrity": "sha512-XseknLAfRHzVWjCEtdviapiBtfLdgyzExD50Rg2ePaucEesyh8Wv4VPdW0nbyDa1ydbrAxV19jvMT4+LFmcNUA==",
+      "version": "8.4.23",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.23.tgz",
+      "integrity": "sha512-bQ3qMcpF6A/YjR55xtoTr0jGOlnPOKAIMdOWiv0EIT6HVPEaJiJB4NLljSbiHoC2RX7DN5Uvjtpbg1NPdwv1oA==",
       "dev": true,
       "funding": [
         {

frontend/package.json

@@ -53,7 +53,7 @@
     "eslint-config-prettier": "^8.8.0",
     "eslint-config-react-app": "^7.0.1",
     "eslint-plugin-prettier": "^4.2.1",
-    "postcss": "^8.4.22",
+    "postcss": "^8.4.23",
     "prettier": "^2.8.7",
     "react-test-renderer": "^18.2.0",
     "storybook": "^7.0.6",