chore(deps): update dependency @gitlab/ui to v20.5.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	20.4.0 -> 20.5.0

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

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Release Notes

gitlab-org/gitlab-ui

v20.5.0

Compare Source

Features

• css: add gl-display-md-block class (e9e3837)
• css: add gl-pt-md-n2/gl-mt-md-n2 classes (ef392eb)

20.4.1 (2020-08-22)

Bug Fixes

• button: Decrease button styles specificity (73d9749)

v20.4.1

Compare Source

Bug Fixes

• button: Decrease button styles specificity (73d9749)

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