test: migrate math/base/special/riemann-zeta to ULP-based assertions

[Devansh-18155]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• Migrates the relative tolerance assertions in math/base/special/riemann-zeta polynomial series tests to ULP difference assertions using @stdlib/assert/is-almost-same-value.
• Updates the tests to require a minimum ULP bound of 1.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352

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No.

Other

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No.

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AI Assistance

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I used AI assistance for testing of the generated code changes.

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