Update dependency gitlab-qa to '~> 8', '>= 8.15.1'

This MR contains the following updates:

Package	Update	Change
gitlab-qa	minor	'~> 8', '>= 8.14.1' -> '~> 8', '>= 8.15.1'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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