(test) Fix broken "z-score" related unit test

[samuelmale]

Requirements

• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

Changes in this PR fix a broken time sensitive test by making sure the internally referenced date is static as opposed to being a moving target.

Screenshots

Related Issue

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Other

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[samuelmale]

The underlying patient record is 8 years relative to the referenced date.

[github-actions]

Size Change: 0 B

Total Size: 1.13 MB

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[denniskigen]

Thanks for the explanation on the call we had earlier, @samuelmale.