fix(deps): update dependency @gitlab/ui to v42.13.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	42.12.0 -> 42.13.0

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

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Release Notes

gitlab-org/gitlab-ui

v42.13.0

Compare Source

Features

• remove gl-grid-gap-6 utility in favor of generic gl-gap-6 (7b6d680)

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