fix test_constants_with_final

[cdeepali]

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• [x] Did you read the contributor guide?
• [ ] Did you update any affected documentation?
• [ ] Did you write any tests to validate this change?

Description

The tests - test_jit_fuser_te is using typing_extension for py38, so am seeing following test failure with py38:

  File "test_jit_fuser_te.py", line 28, in <module>
    from test_jit import backward_graph, all_backward_graphs, get_lstm_inputs, get_milstm_inputs, \
  File "/home/builder/pytorch/test/test_jit.py", line 8, in <module>
    from jit.test_recursive_script import TestRecursiveScript  # noqa: F401
  File "/home/builder/pytorch/test/jit/test_recursive_script.py", line 5, in <module>
    import typing_extensions
ModuleNotFoundError: No module named 'typing_extensions'
Traceback (most recent call last):
  File "test/run_test.py", line 745, in <module>
    main()
  File "test/run_test.py", line 728, in main
    raise RuntimeError(err_message)
RuntimeError: test_jit_fuser_te failed!

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1. All tests and other checks must succeed.
2. At least one maintainer must review and approve.
3. If any maintainer requests changes, they must be addressed.