Add twigcs-a11y when dependency is updated to support symfony 7

[jonasanne]

Currently I removed the twigcs-a11y module since its requires requires friendsoftwig/twigcs ^5.1 but this version does not support symfony 7.0 and this is required in Drupal 11.

https://github.com/friendsoftwig/twigcs/releases/tag/6.4.0

todo

• Add twigcs-a11y when there is a new release that requires friendsoftwig/twigcs ^6.0