Remove reference to a deprecated class

Iceberg/IceSystemEventListener.class.st

@@ -82,7 +82,7 @@ IceSystemEventListener class >> registerSystemAnnouncements [
 	SystemAnnouncer uniqueInstance weak
 		when: ClassAnnouncement send: #handleClassChange: to: self;
 		when: MethodAnnouncement send: #handleMethodChange: to: self;
-		when: ClassTagAnnouncement send: #handlePackageChange: to: self;
+		when: PackageTagAnnouncement send: #handlePackageChange: to: self;
 		when: MCVersionLoaderStopped send: #handleVersionLoaded: to: self.
 ]