chore(deps-dev): bump svelte-check from 4.1.5 to 4.3.0

Bumps [svelte-check](https://github.com/sveltejs/language-tools) from 4.1.5 to 4.3.0.
- [Release notes](https://github.com/sveltejs/language-tools/releases)
- [Commits](sveltejs/language-tools@svelte-check-4.1.5...svelte-check-4.3.0)

---
updated-dependencies:
- dependency-name: svelte-check
  dependency-version: 4.3.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

apps/demo/package.json

@@ -29,7 +29,7 @@
 		"prettier": "^3.5.3",
 		"prettier-plugin-svelte": "^3.3.3",
 		"svelte": "^5.25.5",
-		"svelte-check": "^4.1.5",
+		"svelte-check": "^4.3.0",
 		"svelte-markdoc-preprocess": "workspace:*",
 		"typescript": "^5.8.2",
 		"typescript-eslint": "^8.29.0",