Changelog (v5.3.10...v6.0.0-BETA1)
- feature #42471 Add generic types to traversable implementations (derrabus)
- feature #43788 Require Composer's runtime API to be present (derrabus)
- feature #43804 Deprecate Composer 1 (derrabus)
- feature #43010 Remove remaining support for Doctrine Cache (derrabus)
- feature #42088 add return types and bump to v3 (nicolas-grekas)
- feature #41351 Turn deprecated public services to private (fancyweb)
- feature #41282 Bump Symfony 6 to PHP 8 (nicolas-grekas)