deps(npm): bump @testing-library/svelte in /frontend

Bumps [@testing-library/svelte](https://github.com/testing-library/svelte-testing-library/tree/HEAD/packages/svelte) from 5.2.10 to 5.3.1.
- [Release notes](https://github.com/testing-library/svelte-testing-library/releases)
- [Changelog](https://github.com/testing-library/svelte-testing-library/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testing-library/svelte-testing-library/commits/@testing-library/[email protected]/packages/svelte)

---
updated-dependencies:
- dependency-name: "@testing-library/svelte"
  dependency-version: 5.3.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -62,7 +62,7 @@
     "@tailwindcss/forms": "^0.5.11",
     "@tailwindcss/postcss": "^4.1.18",
     "@testing-library/jest-dom": "^6.6.3",
-    "@testing-library/svelte": "^5.2.6",
+    "@testing-library/svelte": "^5.3.1",
     "@testing-library/user-event": "^14.6.1",
     "@vitest/coverage-v8": "^3.2.4",
     "express": "^5.2.1",