test: fix hardcoded date of birth (2022)

[0x29a]

Description

Removes unused import and fixes test_is_marketable_set_to_false_for_user_created_via_management_command test, which is failing due to the mismatching yearOfBirth:

FAILED common/djangoapps/student/tests/test_models.py::TestUserPostSaveCallback::test_is_marketable_set_to_false_for_user_created_via_management_command - AssertionError: assert (1, {'address...': None, ...}) == (1, {'address...': None, ...})
  At index 1 diff: {'email': 'some.user@example.com', 'username': 'some_user', 'name': 'Student Person', 'age': -1, 'yearOfBirth': 2023, 'education': None, 'address': None, 'gender': 'Male', 'country': '', 'is_marketable': False} != {'email': 'some.user@example.com', 'username': 'some_user', 'name': 'Student Person', 'age': -1, 'yearOfBirth': 2022, 'education': None, 'address': None, 'gender': 'Male', 'country': '', 'is_marketable': False}
  Full diff:
    (
     1,
     {'address': None,
      'age': -1,
      'country': '',
      'education': None,
      'email': 'some.user@example.com',
      'gender': 'Male',
      'is_marketable': False,
      'name': 'Student Person',
      'username': 'some_user',
  -   'yearOfBirth': 2022},
  ?                     ^
  +   'yearOfBirth': 2023},
  ?                     ^
    )
===== 1 failed, 997 passed, 825 skipped, 145 warnings in 101.19s (0:01:41) =====

Testing instructions

All pipeline checks should pass.

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[kdmccormick]

Happy New Year 😂 !

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[asadali145]

This needs to be back-ported to Olive and other maintained releases if any.

[0x29a]

@asadali145, here it is.