Update typed-builder requirement in /crates/mux-client (#55)

---
updated-dependencies:
- dependency-name: typed-builder
  dependency-type: direct:production
...

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Author: dependabot[bot]

crates/mux-client/Cargo.toml

@@ -18,7 +18,7 @@ cfg-if = "1.0.0"
 serde = { version = "1.0.103", features = ["derive"] }
 ssh_format = "0.14.1"
 
-typed-builder = "0.19.1"
+typed-builder = "0.20.0"
 once_cell = "1.10.0"
 
 sendfd = { version = "0.4.1", features = ["tokio"] }