npm-dep: bump svelte from 5.19.8 to 5.19.9 in /frontend

Bumps [svelte](https://github.com/sveltejs/svelte/tree/HEAD/packages/svelte) from 5.19.8 to 5.19.9.
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/main/packages/svelte/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/commits/svelte@5.19.9/packages/svelte)

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

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

frontend/package.json

@@ -29,7 +29,7 @@
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",
 		"prettier-plugin-tailwindcss": "^0.6.11",
-		"svelte": "^5.19.8",
+		"svelte": "^5.19.9",
 		"svelte-check": "^4.1.4",
 		"tailwindcss": "^4.0.3",
 		"tslib": "^2.8.1",