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

[LoayAhmed304]

Progresses #8643 .

Description

What is the purpose of this pull request?

This pull request:

• Simply use dynamic memory allocation for the strided array cumulative sum benchmark (blas/ext/base/dcusumkbn)

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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