Update Rust crate tokio to 1.51.0

Author: oxide-renovate[bot]

dlpi/Cargo.toml

@@ -12,5 +12,5 @@ libc = "0.2"
 thiserror = "2.0"
 num_enum = "0.7"
 pretty-hex = "0.4"
-tokio = { version = "1.50.0", features = ["full"], optional = true }
+tokio = { version = "1.51.0", features = ["full"], optional = true }
 libdlpi-sys = { path = "../libdlpi-sys" }