Add missing ReturnTypeWillChange annotations

Author: Clifford Vickrey

src/PriorityQueue.php

@@ -291,6 +291,7 @@ public function toArray(): array
     /**
      * @inheritDoc
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         while ( ! $this->isEmpty()) {

src/Queue.php

@@ -128,6 +128,7 @@ public function toArray(): array
     /**
      * Get iterator
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         while ( ! $this->isEmpty()) {

src/Stack.php

@@ -130,8 +130,9 @@ public function toArray(): array
     }
 
     /**
-     *
+     * @inheritDoc
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         while ( ! $this->isEmpty()) {

src/Traits/GenericSequence.php

@@ -350,8 +350,9 @@ private function validIndex(int $index)
     }
 
     /**
-     *
+     * @inheritDoc
      */
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         foreach ($this->array as $value) {