Update dependency @gitlab/ui to v17.21.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	17.19.1 -> 17.21.0

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

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Release Notes

gitlab-org/gitlab-ui

v17.21.0

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Features

• css: adding new background utility mixin for data-viz-orange-800 (ecc82a9)

v17.20.0

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Features

• GlFilteredSearch: Style disabled state (314daf8)

v17.19.2

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Bug Fixes

• search-box-by-type: Fix clear button focus (4172c34)

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