owncloud/core

Change: upgrade to Symfony 5

The Symfony PHP framework has been updated from major version 4 to 5.

The following Symfony component versions are provided:
- symfony/console (v5.4.26)
- symfony/event-dispatcher (v5.4.26)
- symfony/process (v5.4.26)
- symfony/routing (v5.4.26)
- symfony/string (v5.4.26)
- symfony/translation (v5.4.24)

https://github.com/owncloud/core/issues/39630
https://github.com/owncloud/core/pull/40518
https://github.com/owncloud/core/pull/40819
https://github.com/owncloud/core/pull/40849
https://github.com/owncloud/core/pull/40895