🚀 Feature Request: Remove checked-fetch & allow fetches to custom ports in wrangler dev

[penalosa]

The limitation around fetching custom ports has been removed when deployed, so we should remove the check locally. See https://developers.cloudflare.com/workers/configuration/compatibility-dates/#allow-specifying-a-custom-port-when-making-a-subrequest-with-the-fetch-api for more context