build(deps-dev): bump postcss from 8.4.47 to 8.4.49 in /frontend

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.47 to 8.4.49.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.47...8.4.49)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/package-lock.json

@@ -70,7 +70,7 @@
     "browserslist-to-esbuild": "^2.1.1",
     "happy-dom": "^15.11.2",
     "i18next-parser": "^9.0.2",
-    "postcss": "^8.4.47",
+    "postcss": "^8.4.49",
     "postcss-modules": "^6.0.0",
     "postcss-nesting": "^13.0.1",
     "react-test-renderer": "^18.3.1",