chore(deps): update dependency @gitlab/ui to v20.9.1

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	20.8.0 -> 20.9.1

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

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Release Notes

gitlab-org/gitlab-ui

v20.9.1

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Bug Fixes

• buttons: Remove white background from resting tertiary buttons (d0d610e)

v20.9.0

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Features

• css: add gl-mt-n2 utility (d5a7c9a)

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