Update Rust crate bb8 to 0.9.0

Author: oxide-renovate[bot]

Cargo.toml

@@ -20,7 +20,7 @@ anyhow = "1.0.98"
 async-bb8-diesel = { git = "https://github.com/oxidecomputer/async-bb8-diesel" }
 async-trait = "0.1.88"
 base64 = "0.22"
-bb8 = "0.8.6"
+bb8 = "0.9.0"
 chrono = "0.4.41"
 clap = { version = "4.5.41", features = ["derive", "string", "env"] }
 config = { version = "0.15.13", features = ["toml"] }