Better type-safety for `bind` method of `D1PreparedStatement`

### Describe the solution

The `bind` method on `D1PreparedStatement` takes `unknown[]` as an argument.
```
declare abstract class D1PreparedStatement {
bind(...values: unknown[]): D1PreparedStatement;
}
```

Ask for more restrictive type so Typescript can provide better type-safety and guardrails for llms.

Reference: https://developers.cloudflare.com/d1/worker-api/#type-conversion