Fix symfony 6.3 deprecation warnings in FactoryTrait.php

[pathmissing]

Replaces the @required annotation with the corresponding attribute in order to fix symfony 6.3 deprecation warnings.
This change introduces a BC break with PHP installations < 8.0.

[J-Ben87]

Hi @pathmissing
Thanks for your contribution!

What would you think if, instead of removing the deprecated @required annotation, we added the #[Required] attribute?
That way the bundle would remain compatible with older PHP and Symfony versions, and the deprecation wouldn't be a (real) problem anymore.

If you are concerned about having third party deprecations in your project, you may consider setting the relevant env variable to SYMFONY_DEPRECATIONS_HELPER=max[direct]=0&quiet[]=indirect&quiet[]=other.

[pathmissing]

Sounds good to me 👍

[J-Ben87]

Amazing, thanks! 👍🏻