Compilation error on Windows

Dependencies

• [2] 55M4M5YU Fake agent client on Windows
• [3] 7FRJYUI6 Reboot because of a bad change

Change contents

• replacement in thrussh-keys/src/agent/client.rs at line 51
  [2.18]→[2.18:61](∅→∅)
  − impl AgentClient<tokio::net::UnixStream> {
  [2.18]

  [2.61]
  + impl AgentClient<tokio::net::TcpStream> {