tracing unsed only from otel feature, so move it to optional

Author: klensy

Cargo.toml

@@ -36,6 +36,7 @@ otel = [
     "dep:opentelemetry",
     "dep:opentelemetry_sdk",
     "dep:tokio",
+    "dep:tracing",
 ]
 
 # Exports code dependent on private interfaces for the integration test suite
@@ -92,7 +93,7 @@ tokio = { workspace = true, optional = true }
 toml = "0.8"
 tracing-opentelemetry = { workspace = true, optional = true }
 tracing-subscriber = { workspace = true, optional = true, features = ["env-filter"] }
-tracing.workspace = true
+tracing = { workspace = true, optional = true }
 url.workspace = true
 wait-timeout = "0.2"
 walkdir = { workspace = true, optional = true }