Update dependency @gitlab/ui to v31.5.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	31.3.0 -> 31.5.0

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

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Release Notes

gitlab-org/gitlab-ui

v31.5.0

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Features

• css: Add padding size to utility class (c40101e)

31.4.1 (2021-07-13)

Bug Fixes

• GlFilteredSearch: Revert "Stop component mutating value prop" (b8940c9)

v31.4.1

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Bug Fixes

• GlFilteredSearch: Revert "Stop component mutating value prop" (b8940c9)

v31.4.0

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Features

• css: Add gl-text-theme-indigo-900 mixin (ef53398)

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