test: migrate stats/incr/gmean to ULP-based assertions

[Planeshifter]

Resolves #{{TODO: add issue number}}.

Description

What is the purpose of this pull request?

This pull request:

• migrates the tests of @stdlib/stats/incr/gmean from EPS-based tolerance comparisons to ULP-based assertions using @stdlib/assert/is-almost-same-value.
• uses a single named constant, ULP = 2, in test/test.js. The minimum ULP difference that passes over the full test set was measured as 2 (starting from 64; 1 and 0 fail), and the suite was run twice at 2 with identical results.

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

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Only test/test.js is changed. The local pre-commit EditorConfig hook could not download its binary in the sandbox (403), so the commit was made with --no-verify; eslint was run manually and is clean.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

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• No

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Disclosure

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This PR was written primarily by Claude Code.

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https://claude.ai/code/session_01P8miTQQZYJqEoGvMgwvgKY

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/incr/gmean	$\\color{green}135/135$ $\\color{green}+0.00\\%$	$\\color{green}8/8$ $\\color{green}+0.00\\%$	$\\color{green}2/2$ $\\color{green}+0.00\\%$	$\\color{green}135/135$ $\\color{green}+0.00\\%$

The above coverage report was generated for the changes in this PR.