#39641 Replace loop variable name to correct the "cache" effect on subsequent calls on the same $product object

[bhennesAdv]

Hello,

This PR is related to #39641

Description (*)

Change a loop variable name to correctly add the "_cache_instance_product_ids" data on the given product to be used on subsequent calls.

Related Pull Requests

None

Fixed Issues (if relevant)

1. Fixes [\Magento\ConfigurableProduct\Model\Product\Type\Configurable] PHP error unoticed #39641

Manual testing scenarios (*)

Let me know if you need some tests for this change

Questions or comments

None, it's just a variable name change in a deprecated method

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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