Deprecate dpnp.fix()

[vlad-perevezentsev]

This PR deprecates dpnp.fix() in favor of dpnp.trunc (following NumPy 2.5)

It adds DPNPDeprecatedUnaryFunc wrapper and updates tests to ignore DeprecationWarning

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• Have you added documentation for your changes, if necessary?
• Have you added your changes to the changelog?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/pull/2730/index.html

[github-actions]

Array API standard conformance tests for dpnp=0.20.0dev1=py313h509198e_63 ran successfully.
Passed: 1227
Failed: 0
Skipped: 9

[coveralls]

coverage: 81.101% (+0.006%) from 81.095%
when pulling 1c552f6 on depr_fix
into f0a397c on master.

[antonwolfy]

Thank you @vlad-perevezentsev
LGTM with a small nit below

[antonwolfy]

It's better to use :func: for a reference on a function in the notes. It will be rendered as dpnp.trunc() then.

Suggested change

	:obj:`dpnp.trunc` instead, as it provides the same functionality of
	:func:`dpnp.trunc` instead, as it provides the same functionality of