CI is failing on main: `conda.trust` deprecations

[isuruf]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

See https://github.com/conda/conda-build/actions/runs/18173405611/job/51733340301:

  File "/usr/share/miniconda/envs/test/lib/python3.9/site-packages/conda/plugins/post_solves/signature_verification.py", line 11, in conda_post_solves
    from ...trust.signature_verification import signature_verification
  File "/usr/share/miniconda/envs/test/lib/python3.9/site-packages/conda/trust/__init__.py", line 8, in <module>
    deprecated.module("25.9", "26.3")
  File "/usr/share/miniconda/envs/test/lib/python3.9/site-packages/conda/deprecations.py", line 277, in module
    self.topic(
  File "/usr/share/miniconda/envs/test/lib/python3.9/site-packages/conda/deprecations.py", line 367, in topic
    warnings.warn(message, category, stacklevel=2 + stack)
DeprecationWarning: conda.trust is deprecated and will be removed in 26.3.

Conda Info

Conda Config

Conda list

Additional Context

No response

[jaimergp]

This is on conda's side, due to the in-progress deprecation at conda/conda#14797. The post-solve plugin is depending on a deprecated module, which hits conda-build. What we can do here is to ignore the deprecation warning by adding an item in this pyproject section.