refactor: pyupgrade second iteration (#27458)

...edx/features/course_experience/api/v1/tests/test_views.py

openedx/features/course_experience/api/v1/urls.py

openedx/features/course_experience/course_tools.py

...atures/course_experience/tests/views/test_course_dates.py

...eatures/course_experience/tests/views/test_course_home.py

...ures/course_experience/tests/views/test_course_outline.py

...eatures/course_experience/tests/views/test_course_sock.py

...features/course_experience/tests/views/test_masquerade.py

openedx/features/course_experience/url_helpers.py

openedx/features/course_experience/views/course_dates.py

openedx/features/course_experience/views/course_home.py

.../features/course_experience/views/course_home_messages.py

openedx/features/course_experience/views/course_updates.py

openedx/features/course_experience/views/welcome_message.py

openedx/features/course_experience/waffle.py