Update dependency @gitlab/duo-ui to ^8.22.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/duo-ui	dependencies	minor	^8.18.0 -> ^8.22.0

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

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Release Notes

gitlab-org/duo-ui (@​gitlab/duo-ui)

v8.22.0

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Features

• agentic-chat: add tool approval flow component (60630a0)

v8.21.0

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Features

• export insert code snippet element (01b883e)

v8.20.0

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Features

• DuoChat: adjust duo chat drawer header UI (27cf5cc)

8.19.1 (2025-06-05)

Bug Fixes

• deps: update dependency @​floating-ui/dom to v1.7.1 (3d18912)

v8.19.0

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Features

• DuoChatMessageSources: update citation styling (74a395f)

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