UTF-16,VCST-5159,VCST-5367,VCST-5485,VCST-5649-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2427 VirtoCommerce/vc-frontend#2427

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Note

Low Risk
Single configuration pointer swap with no application code changes; risk is limited to whatever is in the upstream theme build.

Overview
Updates the deployed storefront theme package for this QA environment by changing the URL in theme/artifact.json from the 2.56.0 build (PR 2451) to 2.57.0 (PR 2427) on vc3prerelease.

This is an automated pin from vc-frontend PR 2427; deploy workflows read this file to set ARTIFACT_URL when publishing the theme.

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