Allow Symfony 6

[greg0ire]

Here is the output of composer outdated after this PR:

Direct dependencies required in composer.json:
league/flysystem        1.1.10  3.15.1 Filesystem abstraction: Many filesystems, one API.
league/flysystem-memory 1.0.2   3.15.0 An in-memory adapter for Flysystem.
psr/log                 1.1.4   3.0.0  Common interface for logging libraries
twig/twig               v2.15.5 v3.6.1 Twig, the flexible, fast, and secure template language for PHP

Transitive dependencies not required in composer.json:
amphp/amp               v2.6.2  v3.0.0 A non-blocking concurrency framework for PHP applications.
amphp/byte-stream       v1.8.1  v2.0.1 A stream abstraction to make working with non-blocking I/O simple.
monolog/monolog         2.9.1   3.4.0  Sends your logs to files, sockets, inboxes, databases and various web services
psr/http-message        1.1     2.0    Common interface for HTTP messages

[greg0ire]

Converting to draft until I can prove we still test with Symfony 5, or make sure that we do if that's not the case.

[greg0ire]

Ok, I think there is a big issue here: https://github.com/phpDocumentor/.github/blob/main/.github/workflows/continues-integration.yml#L31-L70

• matrix.dependencies is never used
• inputs.composer-dependencies is used but… never defined 😐

[greg0ire]

Fixed by phpDocumentor/.github#28

[greg0ire]

Here we can see that Symfony 5 is still being tested: https://github.com/phpDocumentor/guides/actions/runs/5466078620/jobs/9950473579?pr=458#step:5:232

[jaapio]

Thanks for enabling this effort. This will help us move forward!