Update `test_shelve.py` from 3.13.11

[ShaharNaveh]

related to #6410

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[youknowone]

@ShaharNaveh did you also update shelve.py?

[ShaharNaveh]

@ShaharNaveh did you also update shelve.py?

I've tried not to. but I'll try to update it as well

[youknowone]

Lib/X.py and Lib/test/test_X.py is pair. they are usually intended to be updated at the same time

[ShaharNaveh]

Lib/X.py and Lib/test/test_X.py is pair. they are usually intended to be updated at the same time

I'm aware, I've tried to minimize the changes in this PR as my only goal was to update test_shelve.py