Update dependency @gitlab/ui to v78.12.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	78.10.1 -> 78.12.0

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

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Release Notes

gitlab-org/gitlab-ui (@​gitlab/ui)

v78.12.0

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Features

• GlBaseDropdown: Migrates "placement" values to match floating-ui placements (a9f37b6)

v78.11.0

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Features

• GlHeatmap: Add prop to show/hide tooltip (77a0484)

78.10.1 (2024-04-09)

Bug Fixes

• GlLabel: Add fallback value to focus ring CSS variable (2f3c184)

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