Resolve #3465087 "D11 support"

.gitlab-ci.yml

composer.json

modules/ajax_quiz/ajax_quiz.info.yml

modules/quiz_directions/quiz_directions.info.yml

modules/quiz_long_answer/quiz_long_answer.info.yml

modules/quiz_matching/quiz_matching.info.yml

modules/quiz_multichoice/quiz_multichoice.info.yml

modules/quiz_page/quiz_page.info.yml

modules/quiz_short_answer/quiz_short_answer.info.yml

modules/quiz_truefalse/quiz_truefalse.info.yml

quiz.info.yml

src/Form/QuizAdminForm.php

tests/modules/quiz_test/quiz_test.info.yml