Fix release workflow

[leofang]

Description

Fix this error https://github.com/NVIDIA/cuda-python/actions/runs/15613446366/job/43979976338 caused by #640.

+ gh run download 15593389965 -p 'cuda-core*' -R NVIDIA/cuda-python
+ mkdir dist
+ for p in cuda-core*
+ mv cuda-core-python310-linux-64-a13a9173622b1096f30905eb07a9f476bc3bdd18/cuda_core-0.3.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl dist/
+ for p in cuda-core*
+ mv 'cuda-core-python310-linux-64-a13a9173622b1096f30905eb07a9f476bc3bdd18-tests/*.whl' dist/
mv: cannot stat 'cuda-core-python310-linux-64-a13a9173622b1096f30905eb07a9f476bc3bdd18-tests/*.whl': No such file or directory
Error: Process completed with exit code 1.

When we copy the artifacts for PyPI releases, we should not copy the artifacts.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[copy-pr-bot]

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[leofang]

Confirm fixed: https://github.com/NVIDIA/cuda-python/actions/runs/15613768315/job/43981123926, but hit another error. Following up in #706.