Update dependency @gitlab/ui to ^74.7.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	^74.6.0 -> ^74.7.0

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

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Release Notes

gitlab-org/gitlab-ui

v74.7.0

Compare Source

Features

• add purple-500 class: Add utility classes for purple-500 (8a02d5a)

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