Update tower version in example

Author: GeorgeHahn

examples/opentelemetry-tracing/Cargo.toml

@@ -12,7 +12,7 @@ opentelemetry-stdout = { version = "0.3", features = ["trace"] }
 pin-project = "1"
 serde_json = "1.0"
 tokio = "1"
-tower = "0.4"
+tower = "0.5"
 tracing = "0.1"
 tracing-opentelemetry = "0.23"
 tracing-subscriber = "0.3"