Add UPGRADING

Author: kamil-tekiela

UPGRADING

@@ -289,6 +289,8 @@ PHP 8.3 UPGRADE NOTES
     constructor.
   . mysqli_poll now raises a ValueError when the read nor error arguments are
     passed.
+  . mysqli_field_seek and mysqli_result::field_seek now specify return type
+    as true instead of bool.
 
 - ODBC
   . odbc_autocommit() now accepts null for the $enable parameter.

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): true {}
+    public function field_seek(int $index): true {} // TODO make return type void
 
     /**
      * @tentative-return-type