Update dependency @gitlab/ui to v49.2.1

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	49.1.0 -> 49.2.1

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

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Release Notes

gitlab-org/gitlab-ui

v49.2.1

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Bug Fixes

• datepicker: Render empty string instead of false (678b225)

v49.2.0

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Features

• GlBadge: add 12px icon variant (bf47618)
• GlListbox: add ability to reset selection (68bd63f)

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