Update dependency @gitlab/ui to v16.12.1

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	16.10.0 -> 16.12.1

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

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Release Notes

gitlab-org/gitlab-ui

v16.12.1

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Reverts

• Revert "fix(toggles): Add help text to toggles" (ad5c55d)

v16.12.0

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Features

• css: Add negative margin utilities (393581c)
• modal: Set modal max height dynamically (58470b5)

v16.11.0

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Bug Fixes

• toggles: Add help text to toggles (e3a93a4)

Features

• GlLink: Add safe-link directive to gl-link (31817ef)

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