Fix return type of D1PreparedStatement.all

[sdnts]

D1Result's generic parameter expects the type of a single item.

The type of result in the code below is D1Result<User[]>

type User = { id: string }
const result = ctx.d1.prepare("SELECT * FROM users").all<User>()

This means that the type of result.results actually ends up being User[][] instead of User[].

[changeset-bot]

🦋 Changeset detected

Latest commit: 0078f5b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/workers-types	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[sdnts]

cc @mrbbot

[mrbbot]

Nice! Thanks for the PR! 🙂 Fixes #279.