Avoid unnecessary call to Promises.dependent in DependentPromise code

Author: vsilaev

src/main/java/net/tascalate/concurrent/DependentPromise.java

@@ -158,7 +158,7 @@ public DependentPromise<T> orTimeout(Duration duration, boolean cancelOnTimeout)
     public DependentPromise<T> orTimeout(Duration duration, boolean cancelOnTimeout, boolean enlistOrigin) {
         Promise<T> onTimeout = Promises.failAfter(duration);
         // Use *async to execute on default "this" executor
-        return Promises.dependent(this).applyToEitherAsync(
+        return applyToEitherAsync(
             onTimeout, 
             v -> {
                 if (cancelOnTimeout) {
@@ -221,7 +221,7 @@ public DependentPromise<T> onTimeout(Supplier<T> supplier, Duration duration, bo
         // timeout converted to supplier
         Promise<Supplier<T>> onTimeout = Promises.dependent(Promises.delay(duration)).thenApply(d -> supplier, true);
 
-        return Promises.dependent(this)
+        return this
             // resolved value converted to supplier
             .thenApply(valueToSupplier, enlistOrigin)
             // Use *async to execute on default "this" executor