chore(deps): Bump agents from 0.13.0 to 0.20.1 (#70)

Bumps [agents](https://github.com/cloudflare/agents/tree/HEAD/packages/agents) from 0.13.0 to 0.20.1.
- [Release notes](https://github.com/cloudflare/agents/releases)
- [Changelog](https://github.com/cloudflare/agents/blob/main/packages/agents/CHANGELOG.md)
- [Commits](https://github.com/cloudflare/agents/commits/agents@0.20.1/packages/agents)

---
updated-dependencies:
- dependency-name: agents
  dependency-version: 0.20.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]