Update Rust crate tokio to 1.48.0 (#305)

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

Author: oxide-renovate[bot]

Cargo.lock

@@ -45,7 +45,7 @@ sha2 = "0.10.9"
 syn = "2"
 tap = "1.0.1"
 thiserror = "2"
-tokio = "1.47.1"
+tokio = "1.48.0"
 toml = "0.9.8"
 tracing = "0.1.41"
 tracing-subscriber = "0.3.20"