Bump conda-build version

[antonwolfy]

This PR bumps conda-build version from 25.3.2 to 25.4.2.

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[github-actions]

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

[coveralls]

coverage: 72.271%. remained the same
when pulling d54859d on bump-conda-build-version
into 18772b6 on master.

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev1=py312he4f9c94_6 ran successfully.
Passed: 1222
Failed: 0
Skipped: 9