chore(deps): update gitlab ui/svg

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/svgs (source)	dependencies	minor	1.170.0 -> 1.171.0
@gitlab/ui (source)	dependencies	minor	21.19.0 -> 21.21.0

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

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Release Notes

gitlab-org/gitlab-svgs

v1.171.0

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[1.171.0]

• Added illustration 'middleman'

gitlab-org/gitlab-ui

v21.21.0

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Features

• css: Add sm flex column utility (9105ff6)

v21.20.0

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Features

• GlDropdownForm: implement GlDropdownForm component (a169de0)

Performance Improvements

• v-safe-html: Avoid serialize/parse roundtrip (eeba3f0)

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