chore: fix C lint errors (issue #6272)

[sahilk45]

Resolves #6272

Description

Declare array as const in cmap example

This PR adds the const qualifier to the complex array X in the cmap C example.
The array is only used for reading values and is not modified after initialization,
making it a good candidate for the const qualifier.

This pull request:

• Fix c lint error

Related Issues

Does this pull request have any related issues?
It also solves the last issue of #6002

This pull request:

• resolves #{{TODO: add issue number}}

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.

Review it for last requested change of #6002 issue.

Checklist

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

• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Thank you for working on this pull request. However, we cannot accept your contribution as the issue this pull request seeks to resolve has already been addressed in a different pull request or commit.

Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions.