prefer re-exports from actix_web::dev

[robjtede]

Instead of including actix_service explicitly as a dependency, traits used for creating middleware are re-exported from the dev module.

https://docs.rs/actix-web/3.3.2/actix_web/dev/index.html

[AaronErhardt]

Thanks a lot for feedback :)
The actix_service dependency has been removed.