XWIKI-16381: "Failed to load the cache in 5 attempts. Giving up." error log sometimes

* fix missing import

xwiki-platform-core/xwiki-platform-rendering/xwiki-platform-rendering-async/xwiki-platform-rendering-async-default/src/main/java/org/xwiki/rendering/async/internal/AsyncRendererCache.java

@@ -43,6 +43,7 @@
 import org.xwiki.component.phase.InitializationException;
 import org.xwiki.model.reference.EntityReference;
 import org.xwiki.rendering.async.internal.DefaultAsyncContext.RightEntry;
+import org.xwiki.security.authorization.AuthorizationManager;
 
 /**
  * Share cache containing the results of the {@link AsyncRenderer} executions.