Update dependency gitlab-qa to v15.7.0

This MR contains the following updates:

Package	Update	Change
gitlab-qa	minor	15.5.0 -> 15.7.0

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Release Notes

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

v15.7.0

Compare Source

15.7.0 (2025-11-18)

Added (1 change)

• Add ci_server_url to variable list (merge request)

v15.6.0

Compare Source

15.6.0 (2025-10-28)

Added (1 change)

• Automatically pass GLCI variables to test container (merge request)

Changed (4 changes)

• Allow specifying network for instance test runner (merge request)
• Add cells session cookie in documentation (merge request)
• Fix reconfigure_log_file exception (merge request)
• Throw better error when docker commands fail to pull (merge request)

Removed (3 changes)

• Remove epic_sync_test variable (merge request)
• Remove QA_DEBUG env variable (merge request)
• Remove suggested reviewers scenario (merge request)

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