Add `@cloudflare/worker-types` v5 as peerDependency

[JPeer264]

Description

https://developers.cloudflare.com/changelog/post/2026-07-03-workers-types-v5/

The only documented breaking changes are removed dated entrypoints which we are not relying on, so we can support it OOTB.

[linear-code]

JS-2999

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #22180, which was included in the 10.66.0 release.