Fixed incorrect include for ABSL_NAMESPACE_BEGIN

PiperOrigin-RevId: 831364966
Change-Id: Ib2b3346523ffa1627899b1d6df55e3a9d9c41260

Author: Abseil Team

absl/synchronization/notification.h

@@ -52,7 +52,7 @@
 
 #include <atomic>
 
-#include "absl/base/attributes.h"
+#include "absl/base/config.h"
 #include "absl/base/internal/tracing.h"
 #include "absl/synchronization/mutex.h"
 #include "absl/time/time.h"