Implement PHP 8.1's ArrayAccess interface (#3454)

* Implement PHP 8.1's ArrayAccess interface

PHP 8.1 enforces return types for `ArrayAccess` implementations.

* Add changes to changelog

* Use #[\ReturnTypeWillChange] for PHP8.1 ArrayAccess

Co-authored-by: Patrick Brouwers <patrickbrouwersfilm@gmail.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 - Fix queueImport function to be able to assert chained jobs
 - Skipped failure no longer persists in `ToCollection` and `ToArray`.
 - Fix missing InteractsWithQueue trait in AppendToSheet jobs
+- Add return types to `Row`'s `ArrayAccess` implementation
 
 ## [3.1.33] - 2021-08-12
 

src/Row.php

@@ -114,21 +114,25 @@ public function getIndex(): int
         return $this->row->getRowIndex();
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetExists($offset)
     {
         return isset(($this->toArray())[$offset]);
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         return ($this->toArray())[$offset];
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetSet($offset, $value)
     {
         //
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         //