chore: add PHP 8.4 to test-phpunit.yml

[kenjis]

Description
See #9116

• add PHP 8.4 to test-phpunit.yml
• add --ignore-platform-req=php temporarily to @composer update --working-dir=utils

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[kenjis]

Psalm does not work at the moment.

Error: Your requirements could not be resolved to an installable set of packages.
Problem 1
- vimeo/psalm[5.0.0, ..., 5.13.1] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 -> your php version (8.4.0-dev) does not satisfy that requirement.
- vimeo/psalm[5.14.0, ..., 5.25.0] require php ^7.4 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0 -> your php version (8.4.0-dev) does not satisfy that requirement.
- Root composer.json requires vimeo/psalm ^5.0 -> satisfiable by vimeo/psalm[5.0.0, ..., 5.25.0].
Script @composer update --working-dir=utils handling the post-autoload-dump event returned with error code 2
Error: Process completed with exit code 2.

https://github.com/codeigniter4/CodeIgniter4/actions/runs/10481362060/job/29030725682?pr=9133

[kenjis]

Why doesn't continue-on-error: true work?

[paulbalandan]

You should add continue-on-error as part of the workflow step. So, you must add on reusable-phpunit-test.yml

[kenjis]

We do not support PHP 8.4 in v4.5.x.