Wrong Arc import

[bragovo]

Hi there! Why import Arc struct is broken when I use Axum (maybe not only Axum) and SeaORM migrations in VSCode and Lapce (I suppose rust-analyzer lsp)?

It's reproduce here https://github.com/SeaQL/sea-orm/blob/master/examples/axum_example/api/src/lib.rs#L24

And added next string: use migration::RcOrArc; instead use std::sync::Arc;.
After remove dependencies.sea-orm-migration everything works fine.