fix: remove memory leak in `max_heap.c`

[vil02]

Description of Change

max_heap.c has a memory leak. This PR removes it.

References

Checklist

• [x] Added description of change
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes:

Fixes memory leaks in max_heap.c.

[github-actions[bot]]

This pull request has been automatically marked as abandoned because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[vil02]

@Panquesito7 @alexpantyukhin @tjgurwara99 could you please add some dont-close label?