Bump unenv to 2.0.0-rc.21

[vicb]

The only change in 2.0.0-rc.21 is in the node:events module.

This will not affect users as we use the native workerd implementation for this module.
The purpose of this PR is only to sync unenv to the latest released version.

---

• Tests
  • Tests included
  • Tests not necessary because: existing tests do not need to be updated
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: no user facing change
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: unenv not backported to v3

[changeset-bot]

🦋 Changeset detected

Latest commit: 4ec3634

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@cloudflare/vite-plugin	Patch
@cloudflare/unenv-preset	Patch
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Failed to automatically backport this PR's changes to Wrangler v3. Please manually create a PR targeting the v3-maintenance branch with your changes. Thank you for helping us keep Wrangler v3 supported!

Depending on your changes, running git rebase --onto v3-maintenance main vicb/unenv-2.0.0-rc.21 might be a good starting point.

Notes:

• your PR branch should be named v3-backport-10552
• add the skip-v3-pr label to the current PR to stop this workflow from failing

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create-cloudflare

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@cloudflare/pages-shared

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wrangler

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commit: 4ec3634