Update dependency gitlab-qa to v15

This MR contains the following updates:

Package	Update	Change
gitlab-qa	major	14.20.0 -> 15.0.0

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Release Notes

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

v15.0.0

Compare Source

15.0.0 (2024-12-16)

Changed (2 changes)

• Bump version to 15.0.0 (merge request)
• Make MTLS scenario run single threaded (merge request)

Removed (2 changes)

• Remove numbered username variables (merge request)
• [BREAKING] Remove initial root password environment variable (merge request)

v14.21.0

Compare Source

14.21.0 (2024-11-15)

Changed (1 change)

• Adding ImportWithSMTP and Release for gitlab instances (merge request)

Other (2 changes)

• Update release_spec code style to address future rubocop failures (merge request)
• Update spec code style to address future rubocop failures (merge request)

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