Update dependency @gitlab/ui to v29.2.1

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	29.1.0 -> 29.2.1

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

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Release Notes

gitlab-org/gitlab-ui

v29.2.1

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Bug Fixes

• GlDropdown: Dropdown icon only fix with textSrOnly (ddbdd4b)

v29.2.0

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Features

• add gl-translate-y-n50 utility class (81f1dee)

29.1.1 (2021-04-02)

Bug Fixes

• GlForm: Remove background image icon (f2f4900)

v29.1.1

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Bug Fixes

• GlForm: Remove background image icon (f2f4900)

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