ci: Update nightly upload for artifacts v4

[QuLogic]

PR summary

This is a followup to #27563, as it looks like I missed a copy of the artifact name in the nightlies.yml workflow. We instead need to look for a pattern instead of a single name since upload names are now unique.

PR checklist

• [n/a] "closes #0000" is in the body of the PR description to link the related issue
• [n/a] new and changed code is tested
• [n/a] Plotting related features are demonstrated in an example
• [n/a] New Features and API Changes are noted with a directive and release note
• [n/a] Documentation complies with general and docstring guidelines

[greglucas]

I tested this locally with gh run --repo "matplotlib/matplotlib" download "7405461070" --pattern "cibw-wheels-*" and it works as expected.