Update dependency gitlab-qa to v15.3.0

This MR contains the following updates:

Package	Update	Change
gitlab-qa	minor	15.1.0 -> 15.3.0

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Release Notes

gitlab-org/gitlab-qa (gitlab-qa)

v15.3.0

Compare Source

15.3.0 (2025-02-25)

Added (3 changes)

• Add upgrade test scenario from patch to the latest stable (merge request)
• Add a NoVersionCheck instance (merge request)
• Add upgrade test coverage for patch releases upgrades (merge request)

Other (2 changes)

• Bump version to 15.3 (merge request)
• Add AiGateway Log Locations to Docs (merge request)

v15.2.0

Compare Source

15.2.0 (2025-01-26)

Added (1 change)

• Add ability to override scenario suite via environment variable (merge request)

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