Replace magic number by HttpStatus

See gh-15130

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/web/trace/reactive/TraceableServerHttpResponse.java

@@ -21,6 +21,7 @@ import java.util.List;
 import java.util.Map;
 
 import org.springframework.boot.actuate.trace.http.TraceableResponse;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 
 /**
@@ -39,7 +40,7 @@ class TraceableServerHttpResponse implements TraceableResponse {
 	@Override
 	public int getStatus() {
 		return (this.response.getStatusCode() != null)
-				? this.response.getStatusCode().value() : 200;
+				? this.response.getStatusCode().value() : HttpStatus.OK.value();
 	}
 
 	@Override