Update dependency @cloudflare/vitest-pool-workers to ^0.21.0 (#101)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[@cloudflare/vitest-pool-workers](https://redirect.github.com/cloudflare/workers-sdk/tree/main/packages/vitest-pool-workers#readme)
([source](https://redirect.github.com/cloudflare/workers-sdk/tree/HEAD/packages/vitest-pool-workers))
| [`^0.20.0` →
`^0.21.0`](https://renovatebot.com/diffs/npm/@cloudflare%2fvitest-pool-workers/0.20.3/0.21.0)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/@cloudflare%2fvitest-pool-workers/0.21.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@cloudflare%2fvitest-pool-workers/0.20.3/0.21.0?slim=true)
|

---

### Release Notes

<details>
<summary>cloudflare/workers-sdk
(@&#8203;cloudflare/vitest-pool-workers)</summary>

###
[`v0.21.0`](https://redirect.github.com/cloudflare/workers-sdk/blob/HEAD/packages/vitest-pool-workers/CHANGELOG.md#0210)

[Compare
Source](https://redirect.github.com/cloudflare/workers-sdk/compare/@cloudflare/vitest-pool-workers@0.20.3...@cloudflare/vitest-pool-workers@0.21.0)

##### Minor Changes

-
[#&#8203;14994](https://redirect.github.com/cloudflare/workers-sdk/pull/14994)
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3)
Thanks [@&#8203;emily-shen](https://redirect.github.com/emily-shen)! -
Update the Workers Vitest pool for Miniflare's config-based options

The Workers Vitest pool now converts the Miniflare options it creates
for test sessions to Miniflare's config-based `workers` shape.

  For the most part, users should not expect to notice any changes.

However, while `miniflare.modulesRules` is preserved for common text and
WASM fixture imports, it is not a full replacement for Miniflare's old
`modules: true` module graph collection and you may notice some
differences in behaviour.

##### Patch Changes

- Updated dependencies
\[[`6dbd192`](https://redirect.github.com/cloudflare/workers-sdk/commit/6dbd192f1f3e4899789cd327231ba838c90bb0d5),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3),
[`2194f88`](https://redirect.github.com/cloudflare/workers-sdk/commit/2194f888e53a987ee12c75f1f58f5af287e3c8a3)]:
  - <miniflare@5.20260804.0-alpha>
  - wrangler\@&#8203;4.120.1

</details>

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package.json

@@ -25,7 +25,7 @@
     "nanotar": "^0.3.0"
   },
   "devDependencies": {
-    "@cloudflare/vitest-pool-workers": "^0.20.0",
+    "@cloudflare/vitest-pool-workers": "^0.21.0",
     "@types/node": "^24.13.2",
     "esbuild": "^0.28.1",
     "typescript": "^7.0.0",