lock to fix propogation

Author: Fergus Dixon

Cargo.toml

@@ -26,6 +26,6 @@ serde = { version = "^1.0.156", features = ["derive"] }
 serde_json = "^1.0.95"
 tokio = { version = "^1.26.0", features = ["signal"], optional = true }
 tracing = "^0.1.37"
-tracing-opentelemetry = "^0.20.0"
+tracing-opentelemetry = "^0.21.0"
 tracing-serde = "^0.1.3"
 tracing-subscriber = { version = "^0.3.16", features = ["env-filter", "json"] }