sentry-middleware: Switch from `toucan-js` to `@sentry/cloudflare`

### Which middleware is the feature for?

@hono/sentry

### What is the feature you are proposing?

[Upstream is deprecating toucan-js in favor of @sentry/cloudflare](https://github.com/robertcepa/toucan-js/issues/250).

New library: https://github.com/getsentry/sentry-javascript/tree/develop/packages/cloudflare