tests: runtime: out_tcp: added missing header includes
#include <fluent-bit.h>
#include <fluent-bit/flb_sds.h>
#include <fluent-bit/flb_time.h>
+#include <fluent-bit/flb_upstream.h>
+#include <fluent-bit/flb_downstream.h>
#include <string.h>
#include <float.h>
#include <msgpack.h>
