[Docs Site] Bump @cloudflare/vitest-pool-workers from 0.5.20 to 0.5.21

Bumps [@cloudflare/vitest-pool-workers](https://github.com/cloudflare/workers-sdk/tree/HEAD/packages/vitest-pool-workers) from 0.5.20 to 0.5.21.
- [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/[email protected]/packages/vitest-pool-workers)

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

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

Author: dependabot[bot]

package-lock.json

@@ -30,7 +30,7 @@
 		"@astrojs/starlight-tailwind": "^2.0.3",
 		"@astrojs/tailwind": "^5.1.2",
 		"@cloudflare/puppeteer": "^0.0.14",
-		"@cloudflare/vitest-pool-workers": "^0.5.20",
+		"@cloudflare/vitest-pool-workers": "^0.5.21",
 		"@cloudflare/workers-types": "^4.20241018.0",
 		"@codingheads/sticky-header": "^1.0.2",
 		"@stoplight/json-schema-tree": "^4.0.0",