Bump svelte-check from 2.10.3 to 3.4.6 in /frontend

Bumps [svelte-check](https://github.com/sveltejs/language-tools) from 2.10.3 to 3.4.6.
- [Release notes](https://github.com/sveltejs/language-tools/releases)
- [Commits](sveltejs/language-tools@svelte-check-2.10.3...svelte-check-3.4.6)

---
updated-dependencies:
- dependency-name: svelte-check
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -64,7 +64,7 @@
     "sanitize-html": "^2.11.0",
     "sass": "^1.61.0",
     "svelte": "^3.58.0",
-    "svelte-check": "^2.10.3",
+    "svelte-check": "^3.4.6",
     "svelte-copy-to-clipboard": "^0.2.5",
     "svelte-file-dropzone": "0.0.15",
     "svelte-infinite-scroll": "^2.0.1",