Update dependency @gitlab/ui to v21.6.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	21.4.2 -> 21.6.0

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

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Release Notes

gitlab-org/gitlab-ui

v21.6.0

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Features

• css: Add responsive margin to utility class (7ce0152)

v21.5.0

Compare Source

Features

• GLAvatarLabeled: Add slot for meta data (95c7fcc)

21.4.2 (2020-09-17)

Bug Fixes

• dropdown: Correct margin for dropdown headers (f1d707d)

21.4.1 (2020-09-17)

Bug Fixes

• exclude chart component from main components index (dd18a71)

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