chore(deps-dev): bump @cloudflare/vitest-pool-workers

Bumps [@cloudflare/vitest-pool-workers](https://github.com/cloudflare/workers-sdk/tree/HEAD/packages/vitest-pool-workers) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/cloudflare/workers-sdk/releases)
- [Changelog](https://github.com/cloudflare/workers-sdk/blob/main/packages/vitest-pool-workers/CHANGELOG.md)
- [Commits](https://github.com/cloudflare/workers-sdk/commits/@cloudflare/vitest-pool-workers@0.16.4/packages/vitest-pool-workers)

---
updated-dependencies:
- dependency-name: "@cloudflare/vitest-pool-workers"
  dependency-version: 0.16.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -19,7 +19,7 @@
     "typecheck": "tsc --noEmit"
   },
   "devDependencies": {
-    "@cloudflare/vitest-pool-workers": "^0.16.3",
+    "@cloudflare/vitest-pool-workers": "^0.16.4",
     "@types/node": "^25.6.2",
     "prettier": "^3.8.3",
     "typescript": "^6.0.3",