v3.0.0 : Symfony 8+ (Symfony 6.4+, PHP 8.4+)

Changelog

[cdb7f38] feature #246 Add support for Symfony 8.0, drop support for Symfony < 6.4 (@ker0x)
[9d00ebf] minor #249 Prepare 3.0: bump requirements, remove deprecated code, add upgrade guide (@ogizanagi)