refactor: removed redundant throws

Author: AlexanderSchultheiss

src/main/java/org/variantsync/diffdetective/parallel/ScheduledTasksIterator.java

@@ -70,7 +70,7 @@ public T next() {
 
     /** Stops all scheduled tasks and releases the used thread resources. */
     @Override
-    public void close() throws Exception {
+    public void close() {
         threadPool.shutdown();
     }
 }