Solve usleep compilation warning in keyspace_events.c (#11073)
There is a -Wimplicit-function-declaration warning in here:
```
keyspace_events.c: In function ‘KeySpace_NotificationGeneric’:
keyspace_events.c:67:9: warning: implicit declaration of function ‘usleep’; did you mean ‘sleep’? [-Wimplicit-function-declaration]
67 | usleep(1);
| ^~~~~~
| sleep
```
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