remove unused crate

Author: lalitb

opentelemetry-appender-tracing/Cargo.toml

@@ -24,7 +24,6 @@ opentelemetry-stdout = { path = "../opentelemetry-stdout", features = ["logs"] }
 opentelemetry_sdk = { path = "../opentelemetry-sdk", features = ["logs", "testing"]  }
 tracing-subscriber = { workspace = true, features = ["registry", "std", "env-filter"] }
 tracing-log = "0.2"
-async-trait = { workspace = true }
 criterion = { workspace = true }
 tokio = { workspace = true, features = ["full"]}