fix(deps): update dependency @gitlab/ui to v39.4.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	39.3.2 -> 39.4.0

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

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Release Notes

gitlab-org/gitlab-ui

v39.4.0

Compare Source

Features

• GlListbox: create listbox component (dcc7eae)

39.3.2 (2022-04-27)

Bug Fixes

• GlButton: Fix button text color in dark mode (61267e3)

39.3.1 (2022-04-26)

Bug Fixes

• GlModal: Ensure modal dialog has an accessible name (5b35a67)

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