Update dependency @gitlab/ui to v32.68.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	32.66.0 -> 32.68.0

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

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Release Notes

gitlab-org/gitlab-ui

v32.68.0

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Features

• css: Added gl-w-grid-size-28 utility class (e7a29b4)

v32.67.0

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Features

• css: Added gl-md-max-w-15p, gl-lg-max-w-80p (1f44794), closes /gitlab.com/gitlab-org/gitlab/-/merge_requests/74643#note_737689310 /gitlab.com/gitlab-org/gitlab/-/merge_requests/74643#note_764054257

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