Bump undici and wrangler (#13)

Bumps [undici](https://github.com/nodejs/undici) to 5.20.0 and updates ancestor dependency [wrangler](https://github.com/cloudflare/workers-sdk/tree/HEAD/packages/wrangler). These dependencies need to be updated together.


Updates `undici` from 5.9.1 to 5.20.0
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v5.9.1...v5.20.0)

Updates `wrangler` from 2.8.1 to 2.20.0
- [Release notes](https://github.com/cloudflare/workers-sdk/releases)
- [Changelog](https://github.com/cloudflare/workers-sdk/blob/main/packages/wrangler/CHANGELOG.md)
- [Commits](https://github.com/cloudflare/workers-sdk/commits/wrangler@2.20.0/packages/wrangler)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: indirect
- dependency-name: wrangler
  dependency-type: direct:production
...

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