PHP 8.1 compatibility fixes

Author: GrahamCampbell

src/Environment/AbstractVariables.php

@@ -4,6 +4,7 @@
 
 use Dotenv\Environment\Adapter\ArrayAdapter;
 use InvalidArgumentException;
+use ReturnTypeWillChange;
 
 /**
  * This is the abstract variables implementation.
@@ -159,6 +160,7 @@ public function has($name)
     /**
      * {@inheritdoc}
      */
+    #[ReturnTypeWillChange]
     public function offsetExists($offset)
     {
         return $this->has($offset);
@@ -167,6 +169,7 @@ public function offsetExists($offset)
     /**
      * {@inheritdoc}
      */
+    #[ReturnTypeWillChange]
     public function offsetGet($offset)
     {
         return $this->get($offset);
@@ -175,6 +178,7 @@ public function offsetGet($offset)
     /**
      * {@inheritdoc}
      */
+    #[ReturnTypeWillChange]
     public function offsetSet($offset, $value)
     {
         $this->set($offset, $value);
@@ -183,6 +187,7 @@ public function offsetSet($offset, $value)
     /**
      * {@inheritdoc}
      */
+    #[ReturnTypeWillChange]
     public function offsetUnset($offset)
     {
         $this->clear($offset);