npm-dep: bump @sveltejs/kit from 2.5.5 to 2.5.6 in /frontend

Bumps [@sveltejs/kit](https://github.com/sveltejs/kit/tree/HEAD/packages/kit) from 2.5.5 to 2.5.6.
- [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@2.5.6/packages/kit)

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

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

frontend/package.json

@@ -17,7 +17,7 @@
 	"devDependencies": {
 		"@eslint/js": "^9.0.0",
 		"@sveltejs/adapter-static": "^3.0.1",
-		"@sveltejs/kit": "^2.5.5",
+		"@sveltejs/kit": "^2.5.6",
 		"@sveltejs/vite-plugin-svelte": "^3.1.0",
 		"@typescript-eslint/eslint-plugin": "^7.6.0",
 		"@typescript-eslint/parser": "^7.6.0",