chore(deps): update rust crate rand to 0.8.5 (#228)

Author: oxide-renovate[bot]

Cargo.toml

@@ -76,7 +76,7 @@ sled = "0.34"
 ciborium = "0.2.2"
 http = "0.2.12"
 humantime = "2.1"
-rand = "0.8"
+rand = "0.8.5"
 backoff = "0.4"
 mg-common = { path = "mg-common" }
 chrono = { version = "0.4.38", features = ["serde"] }