Update Rust crate serde_json to 1.0.140 (#446)

Co-authored-by: oxide-renovate[bot] <146848827+oxide-renovate[bot]@users.noreply.github.com>

Author: oxide-renovate[bot]

Diff for: Cargo.toml

@@ -57,7 +57,7 @@ serde_repr = "0.1"
 anyhow = "1.0.97"
 hyper = "1.6.0"
 hyper-util = { version = "0.1", features = ["full"] }
-serde_json = "1.0.133"
+serde_json = "1.0.140"
 percent-encoding = "2.3.1"
 libnet = { git = "https://github.com/oxidecomputer/netadm-sys", branch = "main" }
 progenitor = "0.9.1"