Update openssh-mux-client requirement from 0.15.1 to 0.17.0 (#131)

Updates the requirements on [openssh-mux-client](https://github.com/openssh-rust/openssh-mux-client) to permit the latest version.
- [Release notes](https://github.com/openssh-rust/openssh-mux-client/releases)
- [Commits](https://github.com/openssh-rust/openssh-mux-client/commits)

---
updated-dependencies:
- dependency-name: openssh-mux-client
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.toml

@@ -47,7 +47,7 @@ tokio-pipe = "0.2.8"
 once_cell = "1.8.0"
 dirs = "5.0.0"
 
-openssh-mux-client = { version = "0.15.1", optional = true }
+openssh-mux-client = { version = "0.17.0", optional = true }
 
 libc = "0.2.137"