Update Rust crate tokio to 1.38.2 [SECURITY] (#22)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 [dependencies]
 octocrab  = "0.49.0"
 concourse-resource = "0.3"
-tokio = { version = "1.37.0", features = ["rt-multi-thread", "macros"] }
+tokio = { version = "1.38.2", features = ["rt-multi-thread", "macros"] }
 serde = "1.0.197"
 serde_json = "1.0.104"