Update Rust crate libc to 0.2.178 (#87)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Sean Klein <sean@oxide.computer>

Author: renovate[bot]

Cargo.toml

@@ -25,7 +25,7 @@ tokio = { version = "1.32", default-features = false, features = [ "rt-multi-thr
 anyhow = "1.0"
 crdb-harness = "0.0.1"
 diesel = { version = "2.2.2", features = [ "postgres", "r2d2" ] }
-libc = "0.2.154"
+libc = "0.2.178"
 tempfile = "3.8"
 tokio = { version = "1.32", features = [ "macros", "fs", "process" ] }
 tokio-postgres = { version = "0.7", features = [ "with-chrono-0_4", "with-uuid-1" ] }