VCST-4896-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2269 VirtoCommerce/vc-frontend#2269

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Note

Low Risk
Low risk: a single configuration change that only updates the referenced artifact download URL; rollback is just reverting the URL if the package is bad.

Overview
Updates theme/artifact.json to reference a newer prerelease vc-theme-b2b-vue package artifact for PR 2269 (new build hash in the download URL), aligning the QA deployment with the latest generated zip.

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