chore(deps): update dependency @gitlab/ui to v20.10.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	20.9.1 -> 20.10.0

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

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Release Notes

gitlab-org/gitlab-ui

v20.10.0

Compare Source

Features

• GlSkeletonLoader: migrate GlSkeletonLoading into GlSkeletonLoader (fa3ec21)

20.9.1 (2020-08-25)

Bug Fixes

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

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