Release futures-concurrency v7.4.1

I just published futures-concurrency v7.4.1 which adds support for lending iteration on the newly added Group types!

https://github.com/yoshuawuyts/futures-concurrency/releases/tag/v7.4.1

This should replace the final remaining use there was for select!, meaning we now have structured alternatives for all kinds of concurrency operations you could possibly want to express.