chore(deps-dev): bump prettier-plugin-packagejson in /src/frontend (#50)

Bumps [prettier-plugin-packagejson](https://github.com/matzkoh/prettier-plugin-packagejson) from 2.5.20 to 2.5.21.
- [Release notes](https://github.com/matzkoh/prettier-plugin-packagejson/releases)
- [Commits](matzkoh/prettier-plugin-packagejson@v2.5.20...v2.5.21)

---
updated-dependencies:
- dependency-name: prettier-plugin-packagejson
  dependency-version: 2.5.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/frontend/package-lock.json

@@ -49,7 +49,7 @@
 		"mode-watcher": "^1.1.0",
 		"playwright": "^1.57.0",
 		"prettier": "^3.7.4",
-		"prettier-plugin-packagejson": "^2.5.20",
+		"prettier-plugin-packagejson": "^2.5.21",
 		"prettier-plugin-svelte": "^3.4.0",
 		"prettier-plugin-tailwindcss": "^0.7.2",
 		"qrcode": "^1.5.4",