bench: refactor to use dynamic memory allocation in blas/ext/base/ssumkbn

[Omar-2718]

… with dynamic memory allocation

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

Description

What is the purpose of this pull request?

This pull request:

• replace static memory allocation of large arrays in C benchmarks with dynamic memory allocation (tracking issue)

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: replace static memory allocation of large arrays in C benchmarks with dynamic memory allocation (tracking issue) #8643

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No.

Other

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No.

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

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

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• Test/benchmark generation
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Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

{{TODO: add disclosure if applicable}}

---

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/ssumkbn	$\color{red}405/408$ $\color{green}+0.00%$	$\color{red}29/30$ $\color{green}+0.00%$	$\color{green}4/4$ $\color{green}+0.00%$	$\color{red}405/408$ $\color{green}+0.00%$

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

[kgryte]

LGTM

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Thank you for your contribution and congratulations on your first PR!