download and upload files in parallel

Author: aphralG

go.mod

@@ -81,6 +81,7 @@ require (
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.27.0
 	golang.org/x/mod v0.29.0
+	golang.org/x/sync v0.17.0
 	google.golang.org/protobuf v1.36.9
 )
 
@@ -336,7 +337,6 @@ require (
 	golang.org/x/arch v0.20.0 // indirect
 	golang.org/x/exp v0.0.0-20250808145144-a408d31f581a // indirect
 	golang.org/x/oauth2 v0.30.0 // indirect
-	golang.org/x/sync v0.17.0 // indirect
 	golang.org/x/time v0.12.0 // indirect
 	golang.org/x/tools v0.37.0 // indirect
 	gonum.org/v1/gonum v0.16.0 // indirect