Merge pull request #709 from ankurk91/php-8.1-compat

[3.0] fix: php 8.1 support

Author: freekmurze

src/QueryBuilder.php

@@ -153,22 +153,22 @@ public function __set($name, $value)
         $this->subject->{$name} = $value;
     }
 
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->subject[$offset]);
     }
 
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return $this->subject[$offset];
     }
 
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         $this->subject[$offset] = $value;
     }
 
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->subject[$offset]);
     }