fix: reconciler sample missing generics

Signed-off-by: Attila Mészáros <csviri@gmail.com>

Author: csviri

operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/primaryindexer/DependentPrimaryIndexerTestReconciler.java

@@ -30,7 +30,7 @@ public class DependentPrimaryIndexerTestReconciler extends AbstractPrimaryIndexe
   public static final String CONFIG_MAP_EVENT_SOURCE = "configMapEventSource";
 
   @Override
-  public List<EventSource> prepareEventSources(
+  public List<EventSource<?, PrimaryIndexerTestCustomResource>> prepareEventSources(
       EventSourceContext<PrimaryIndexerTestCustomResource> context) {
 
     var cache = context.getPrimaryCache();