build(deps-dev): bump @sveltejs/kit from 2.20.7 to 2.20.8 in /frontend (#478)

Bumps [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit) from 2.20.7 to 2.20.8.
- [Release notes](https://github.com/sveltejs/kit/releases)
- [Changelog](https://github.com/sveltejs/kit/blob/main/packages/kit/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/kit/commits/@sveltejs/kit@2.20.8/packages/kit)

---
updated-dependencies:
- dependency-name: "@sveltejs/kit"
  dependency-version: 2.20.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

frontend/package-lock.json

@@ -18,7 +18,7 @@
 		"@eslint/js": "^9.25.1",
 		"@sveltejs/adapter-static": "^3.0.8",
 		"@sveltejs/vite-plugin-svelte": "^5.0.3",
-		"@sveltejs/kit": "^2.20.7",
+		"@sveltejs/kit": "^2.21.0",
 		"@types/eslint": "^9.6.1",
 		"@typescript-eslint/eslint-plugin": "^8.32.0",
 		"@typescript-eslint/parser": "^8.32.0",