chore(deps-dev): bump vitest from 3.2.4 to 4.0.16 in /packages/svelte

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 3.2.4 to 4.0.16.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.16/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 4.0.16
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/svelte/package.json

@@ -63,7 +63,7 @@
     "svelte-check": "^4.1.4",
     "typescript": "^5.4.0",
     "vite": "^6.0.0",
-    "vitest": "^3.2.4"
+    "vitest": "^4.0.16"
   },
   "engines": {
     "node": ">=18.0.0"