Update dependency @gitlab/ui to v66

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	major	65.3.1 -> 66.0.1

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

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Release Notes

gitlab-org/gitlab-ui

v66.0.1

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Reverts

• feat(GlToggle): Add a block level toggle (c092403)

v66.0.0

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Code Refactoring

• Remove GlSkeletonLoading component (a2cf859)

BREAKING CHANGES

• GlSkeletonLoading has been deprecated since v20.10.0.

v65.4.0

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Features

• CSS: add gl-sm-justify-content-start utility CSS class (4f7e923)

65.3.1 (2023-08-17)

Bug Fixes

• revert setting fixed height on form control (29fe576)

Reverts

• add default styling for GlInputGroupText (ace959e)

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