add missing include (#36708)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/36708

`#include` what you use!

Changelog: [Internal]

Reviewed By: ispeters

Differential Revision: D44516344

fbshipit-source-id: a96afe7a7098609270f1d25321133a9afb443db2

packages/react-native/ReactCommon/react/renderer/core/EventListener.cpp

@@ -7,6 +7,8 @@
 
 #include "EventListener.h"
 
+#include <mutex>
+
 namespace facebook::react {
 
 bool EventListenerContainer::willDispatchEvent(const RawEvent &event) {