Change return type for mysqli_result::field_seek

Author: kamil-tekiela

ext/mysqli/mysqli.stub.php

@@ -1144,7 +1144,7 @@ public function fetch_column(int $column = 0): null|int|float|string|false {}
      * @tentative-return-type
      * @alias mysqli_field_seek
      */
-    public function field_seek(int $index): bool {}
+    public function field_seek(int $index): true {}
 
     /**
      * @tentative-return-type