Bump socket2 from 0.5.10 to 0.6.0 (#429)

Bumps [socket2](https://github.com/rust-lang/socket2) from 0.5.10 to 0.6.0.
- [Release notes](https://github.com/rust-lang/socket2/releases)
- [Changelog](https://github.com/rust-lang/socket2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/socket2/commits)

---
updated-dependencies:
- dependency-name: socket2
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -58,7 +58,7 @@ slog = { version = "2.7", features = ["max_level_trace", "release_max_level_trac
 slog-async = "2.8"
 slog-term = "2.9"
 smoltcp = { version = "0.9", default-features = false, features = ["proto-ipv6"] }
-socket2 = "0.5.10"
+socket2 = "0.6.0"
 ssh-agent-client-rs = "0.9.1"
 ssh-key = { version = "0.6.7", features = ["p256"] }
 static_assertions = "1.1.0"