[5.4] Add php 8.5 to unit and integration tests

[HLeithner]

Add PHP 8.5 to ci.

[laoneo]

I guess it needs also the cypress8.5 docker image. I created the branch, but not the required changes yet.

[HLeithner]

I know, but hadn't the time yet. Will come next

[HLeithner]

Ok I checked, php 8.5 for debian/our cypress docker container and I don't have the time to compile and maintain this my self I would suggest to merger this after 5.4 final release and wait for the excellent php 8.5 packages provided on https://deb.sury.org by @oerdnj (thanks for all your work Ondřej).

[richard67]

System tests will be done with another PR?

Update 2025-10-17: They have been added meanwhile to this PR.

[richard67]

After the recent fixed and dependency updates in the 5.4-dev branch for the PHP 8.5 deprecations, it seems there is only this one missing for making system tests pass:

PHP Deprecated:  The __sleep() serialization magic method has been deprecated. Implement __serialize() instead (or in addition, if support for old PHP versions is necessary) in /tests/www/cmysqlmax...

It comes from test cli/Session.cy.js.

[heelc29]

After the recent fixed and dependency updates in the 5.4-dev branch for the PHP 8.5 deprecations, it seems there is only this one missing for making system tests pass:

PHP Deprecated:  The __sleep() serialization magic method has been deprecated. Implement __serialize() instead (or in addition, if support for old PHP versions is necessary) in /tests/www/cmysqlmax...

It comes from test cli/Session.cy.js.

Here we need php8.5.0rc2