Update dependency @gitlab/ui to v43.20.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	43.18.0 -> 43.20.0

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

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Release Notes

gitlab-org/gitlab-ui

v43.20.0

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Features

• css: Add gl-md-ml-auto (c9a4338)

v43.19.0

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Features

• css: Adds sticky position utility classes (29fc153)
• css: remove gl-lg-top-13 and gl-lg-align-items-flex-start (bbad117)

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