Make isNextReconciliationImminent synchronized

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/EventProcessor.java

@@ -508,7 +508,7 @@ public synchronized void start() throws OperatorException {
     handleAlreadyMarkedEvents();
   }
 
-  public boolean isNextReconciliationImminent(ResourceID resourceID) {
+  public synchronized boolean isNextReconciliationImminent(ResourceID resourceID)
     return isNextReconciliationImminent(resourceStateManager.getOrCreate(resourceID));
   }