civix upgrade 23.02.1

This civix upgrade is necessary for Smarty3 compatibility.

I don't like accepting civix upgrade MRs myself, I'd rather run it manually and not have to worry about malicious changes. If you prefer that as well, you can close this MR and run civix upgrade in the extension root.

@JonGold - thanks alot, that's much appreciated. It's been on my to do and I've been away.

Do you know if the addition of the 'theme-php' mixin was the Civix upgrade script? Maybe lack of that is why the theme sometimes doesn't stay selected after an upgrade.

merged

mentioned in commit f503a75b

Had a quick test of this - all seems good. Thanks again.

mentioned in issue #19 (closed)