Fix `test_add_subparsers_twice` with Python 3.12.5

[martinjm97]

Hi @shadchin, thank you for the contribution! Do you happen to have a reference to the change in Python 3.12.5 and a reason for why it will persist to future versions of Python?

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.07%. Comparing base (b569790) to head (d7f7f9d).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #146 +/- ## ======================================= Coverage 94.07% 94.07% ======================================= Files 4 4 Lines 692 692 ======================================= Hits 651 651 Misses 41 41 ```

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[shadchin]

Hi @shadchin, thank you for the contribution! Do you happen to have a reference to the change in Python 3.12.5 and a reason for why it will persist to future versions of Python?

https://github.com/python/cpython/issues/121018

[martinjm97]

Perfect! Thank you!