chore(deps): update dependency @gitlab/ui to v31.1.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	31.0.1 -> 31.1.0

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

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Release Notes

gitlab-org/gitlab-ui

v31.1.0

Compare Source

Features

• css: Add gl-left-50p utility class (65dd918)

31.0.1 (2021-07-08)

Bug Fixes

• GlLabel: Fix visibility of underline on hover and focus state (790aa16)

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