Update dependency @gitlab/ui to ^66.9.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	^66.7.1 -> ^66.9.0

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

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Release Notes

gitlab-org/gitlab-ui

v66.9.0

Compare Source

Features

• adds css-based skeleton loader (445fc09)

v66.8.0

Compare Source

Features

• css: add gl-lg-max-w-50p utility (0139a72)

66.7.1 (2023-09-13)

Bug Fixes

• NewListboxItem: Update interactive styles to design spec (17f773f)

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