Replace yulewalker in audio_filtes/equal_loudness_filter

[CaedenPH]

Feature description

https://pypi.org/project/yulewalker/ is no longer maintained it seems, which is logging a warning in the audio_filters/equal_loudness_filter.py.

Fixes: #7300

[Sahil2315]

what needs to be done?

[CaedenPH]

what needs to be done?

In this file
https://github.com/TheAlgorithms/Python/blob/master/audio_filters/equal_loudness_filter.py#L5
The module yulewalker is used. This module uses np.int which is deprecataed and raises warnings
Ideally, this module would be swithed out with a later, maintained package, or the code would be refactored in order to not use yulewalker