refactor: pyupgrade in common/tests (#26725)

common/test/acceptance/fixtures/__init__.py

common/test/acceptance/fixtures/base.py

common/test/acceptance/fixtures/catalog.py

common/test/acceptance/fixtures/certificates.py

common/test/acceptance/fixtures/config.py

common/test/acceptance/fixtures/course.py

common/test/acceptance/fixtures/discussion.py

common/test/acceptance/fixtures/library.py

common/test/acceptance/fixtures/programs.py

common/test/acceptance/pages/common/__init__.py

common/test/acceptance/pages/common/auto_auth.py

common/test/acceptance/pages/common/utils.py

common/test/acceptance/pages/lms/__init__.py

common/test/acceptance/pages/lms/account_settings.py

common/test/acceptance/pages/lms/course_home.py

common/test/acceptance/pages/lms/course_page.py

common/test/acceptance/pages/lms/course_wiki.py

common/test/acceptance/pages/lms/courseware.py

common/test/acceptance/pages/lms/dashboard.py

common/test/acceptance/pages/lms/discussion.py