Update Rust crate rand to 0.9.1

Author: oxide-renovate[bot]

Cargo.toml

@@ -78,7 +78,7 @@ ciborium = "0.2.2"
 http = "1.3.1"
 http-body-util = "0.1"
 humantime = "2.1"
-rand = "0.8.5"
+rand = "0.9.1"
 backoff = "0.4"
 mg-common = { path = "mg-common" }
 chrono = { version = "0.4.40", features = ["serde"] }