Update dependency @gitlab/ui to v20

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	major	18.7.0 -> 20.1.1

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

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Release Notes

gitlab-org/gitlab-ui

v20.1.1

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Bug Fixes

• GlIntersperse: allow class attributes passed to component (a101c36)

v20.1.0

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Features

• textarea: Add debounce/lazy support (cf699aa)

v20.0.0

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Features

• v-safe-html: Switch from sanitize-html to DOMpurify (ff8b602)

BREAKING CHANGES

• v-safe-html: v-safe-html extended API changed. Under the hood we are now using DOMpurify. Please refer to their API for upgrading: https://github.com/cure53/DOMPurify

19.0.1 (2020-08-17)

Bug Fixes

• css: Update utility generate functione (2cc011c)

v19.0.1

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Bug Fixes

• css: Update utility generate functione (2cc011c)

v19.0.0

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Features

• buttons: Make tertiary buttons borderless (9703bf3)
• css: hover utility (ff026f2)

BREAKING CHANGES

• buttons: Adds styling for tertiary buttons using secondary styles with no border on all states

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