remove postcard dep from proc-macro-srv-cli

Author: Shourya742

Cargo.lock

@@ -16,7 +16,6 @@ doctest = false
 [dependencies]
 proc-macro-srv.workspace = true
 proc-macro-api.workspace = true
-postcard.workspace = true
 clap = {version = "4.5.42", default-features = false, features = ["std"]}
 
 [dev-dependencies]