Bump conda-build version

[antonwolfy]

This PR bumps conda-build version from 25.11.1 to 26.5.0.

The upgrade pulls in py-lief 0.17, which crashes conda-build's post-build overlinking check on Windows while inspecting the compiled dpnp backend DLL:

File ".../conda_build/os_utils/liefldd.py", line 1092, in get_exports
result = [str(e) for e in binary.exported_functions]
AttributeError: 'Binary' object has no attribute 'exported_functions'

The failure occurs during the Packaging dpnp phase.

• 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/2753/index.html

[coveralls]

coverage: 78.109% (-0.002%) from 78.111% — bump-conda-build-version into master

[github-actions]

Array API standard conformance tests for dpnp=0.21.0dev2=py313h509198e_26 ran successfully.
Passed: 1372
Failed: 3
Skipped: 5