Fail to cargo publish ckb-spec because of the dep cacache

[doitian]

Why tokio-runtime is removed? It leads to failure of cargo publish because of the following error:

error[E0412]: cannot find type `State` in this scope                                                                                                                        

   --> /home/ubuntu/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cacache-13.1.0/src/content/write.rs:430:37                                                         

    |                                                                                 

430 | fn update_state(current_state: &mut State, next_state: State) {                                                                                                       

    |                                     ^^^^^ not found in this scope                                                                                                     

                                                                                                                                                                            

error[E0412]: cannot find type `State` in this scope                                                                                                                        

   --> /home/ubuntu/.cargo/registry/src/index.crates.io-6f17d22bba15001f/cacache-13.1.0/src/content/write.rs:430:56                                                         

    |                                                                                                                                                                       

430 | fn update_state(current_state: &mut State, next_state: State) {                                                                                                       

    |                                                        ^^^^^ not found in this scope

Originally posted by @doitian in 4cd7dce

[doitian]

Closed by #4736