build(deps-dev): bump @cloudflare/workers-types

Bumps [@cloudflare/workers-types](https://github.com/cloudflare/workerd) from 4.20260608.1 to 4.20260615.1.
- [Release notes](https://github.com/cloudflare/workerd/releases)
- [Changelog](https://github.com/cloudflare/workerd/blob/main/RELEASE.md)
- [Commits](https://github.com/cloudflare/workerd/commits)

---
updated-dependencies:
- dependency-name: "@cloudflare/workers-types"
  dependency-version: 4.20260615.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]