Update dependency @gitlab/ui to v23.4.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	23.3.0 -> 23.4.0

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

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Release Notes

gitlab-org/gitlab-ui

v23.4.0

Compare Source

Features

• css: Add margins space levels 4 and 5 (2ee1371)

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