fix bug when running upgrade

[ggoffy]

No description provided.

[mambax7]

Thanks for the submission. Actually, the change will be:

xoops_setcookie('xo_upgrade_lang', $upgrade_language, 0, '', '');

but I didn't commit it yet.

I'll approve yours right now, and then update it with the rest of the stuff that I'm working on.

[Copilot]

Pull request overview

This PR fixes a type error in the upgrade process by correcting the xoops_setcookie function call to use proper type-safe parameters. The xoops_setcookie function signature was modernized with strict type hints, requiring the $expire parameter to be an int rather than null.

Changes:

• Updated the xoops_setcookie call in the upgrade language determination logic to pass 0 instead of null for the expire parameter

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