Allow opt-in PHP 8.5 testing

Issue information

From user: andypost

Related to !431 (merged) !395 (merged)

Contribution record

Fork management

Problem/Motivation

There's PHP 8.5 going to core #3512558: [CI] Run Unit tests on PHP 8.5 nightly and images are rebuild every Friday #3512443: Add a PHP 8.5 image for early testing

Proposed resolution

As Drupal core 11.2 released increase CORE_PHP_NEXT to 8.5
PS: contrib's early adopters can use https://hub.docker.com/r/drupalci/php-8.5-ubuntu-apache/tags

Remaining tasks

- wait 11.2 release
- create MR and promote

User interface changes

API changes

Data model changes

Edited by drupalbot
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