Update Rust crate tracing-subscriber to 0.3.1 (#23)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

Cargo.lock

@@ -23,4 +23,4 @@ tower-service = "0.3"
 conduit-router = "0.9.0-alpha.7"
 futures-util = "0.3"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
-tracing-subscriber = "0.2.22"
+tracing-subscriber = "0.3.1"