TST: add test for unsorted segmented index

[audeerington]

This adds a test case for the issue described in #32 when augmenting an unsorted segmented index.

The test currently fails because the resulting augmented index is in a different order than the input index.

[audeerington]

In addition to the expected failed test in test_interface.py, there are also failed tests for test_transform_babble_noise.py and test_transform_pink_noise.py. I guess a change in the installed packages is the cause of this, but not sure yet why exactly.

[hagenw]

I created #34 to fix the numpy 2.0 related test failures.

[hagenw]

Thanks for adding the test, I will try to fix it, or did you start working on it already?

[audeerington]

Thanks, I haven't started on it yet!

[hagenw]

I created #36 that incorporates your proposed test, updates it slightly, and also provides a fix for it.

[hagenw]

Closing in favor of #36