test: fix logging tracer test

Author: diegomarquezp

sdk-platform-java/gax-java/gax/src/main/java/com/google/api/gax/tracing/LoggingTracer.java

@@ -80,7 +80,7 @@ void recordActionableError(Throwable error) {
 
     logContext.put(
         ObservabilityAttributes.RPC_RESPONSE_STATUS_ATTRIBUTE,
-        ObservabilityUtils.extractStatus(error));
+        ObservabilityUtils.extractStatus(error).toString());
 
     ErrorInfo errorInfo = ObservabilityUtils.extractErrorInfo(error);
     if (errorInfo != null) {