Update dependency @gitlab/ui to v17.40.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	17.39.0 -> 17.40.0

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

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Release Notes

gitlab-org/gitlab-ui

v17.40.0

Compare Source

Features

• GlFormText: Add component (9081c88)

17.39.1 (2020-07-29)

Bug Fixes

• GlTokenSelector: wait for prop changes before closing dropdown (5fef66d)

v17.39.1

Compare Source

Bug Fixes

• GlTokenSelector: wait for prop changes before closing dropdown (5fef66d)

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