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

[opbot-xd]

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Progresses #8643.

Description

What is the purpose of this pull request?

This pull request:

• Refactors the C benchmarks for @stdlib/blas/ext/base/dsumors to use dynamic memory allocation instead of static memory allocation for large arrays.

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
• [BUG]: Segmentation fault when running C benchmarks #369

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.

No.

Checklist

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

• Read, understood, and followed the [contributing guidelines][contributing].

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dsumors	$\color{green}384/384$ $\color{green}+100.00%$	$\color{green}27/27$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}384/384$ $\color{green}+100.00%$

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

[kgryte]

LGTM