Update link for input files

[eirikurj]

Purpose

This PR updates the link to download the input files for tests.

Using the current link fails with the message shown below.

Connecting to umich.edu (umich.edu)|172.66.0.37|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2025-05-06 07:10:08 ERROR 403: Forbidden.

Expected time until merged

When tests pass

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation