Fix XML Schema Location

[sprankhub]

Description (*)

This PR changes the XML schema location from a relative path to the preferred urn format.

Related Pull Requests

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Fixed Issues (if relevant)

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Manual testing scenarios (*)

n/a

Questions or comments

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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)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[magento-engcom-team]

Hi @ihor-sviziev, thank you for the review.
ENGCOM-7245 has been created to process this Pull Request

[engcom-Alfa]

✔️ QA Passed

[m2-assistant]

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