Fix phpstan errors for Symfony 7 and Drupal 11.3 compatibility

Wolfgang Zieglerrequested to merge
issue/lupus_ce_renderer-3568707:3568707-automated-tests-fail into 2.x
  • Add phpstan-ignore for isRedirect() override (needed for BC)
  • Replace deprecated Request::get() with Request::attributes->get()

Closes #3568707

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