refactor: do not wrap shadowsocks::ProxyClientStream

Updated `shadowsocks` implements `Debug` for the type,
so there is no need to wrap it.

Cargo.lock

@@ -1315,7 +1315,6 @@ dependencies = [
  "parking_lot",
  "percent-encoding",
  "pgp",
- "pin-project",
  "pretty_assertions",
  "proptest",
  "qrcodegen",
@@ -5385,9 +5384,9 @@ dependencies = [
 
 [[package]]
 name = "shadowsocks"
-version = "1.20.2"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06b6af20f0f009894644c9fb149ce6244c69b0a264ffcf7a53cbb3dd4883e4a3"
+checksum = "5ecb3780dfbc654de9383758015b9bb95c6e32fecace36ebded09d67e854d130"
 dependencies = [
  "aes",
  "async-trait",