chore: update nats -> async nats

crates/flux-releaser/src/services/flux_releaser_uploader.rs

@@ -1,8 +1,7 @@
-use tonic::transport::Channel;
 
 use crate::{
     app::infra::grpc::FluxReleaserGrpcClient,
-    grpc::gen::{flux_releaser_client::FluxReleaserClient, UploadArtifactRequest},
+    grpc::gen::UploadArtifactRequest,
 };
 
 use super::{archive::ArchiveFile, release_manager::models::UploadArtifactID};