The version pin at https://github.com/bolcom/libunftp/blob/master/Cargo.toml#L49 is problematic if you have other dependencies with async-trait = "^0.1.89" which is the newest version (for example see in matrix-rust-sdk 0.16.0 - https://github.com/matrix-org/matrix-rust-sdk/blob/main/Cargo.toml#L35). Is there a particular reason for it?