Update dependency @gitlab/ui to ^78.19.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui	dependencies	minor	^78.7.0 -> ^78.19.0

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

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Release Notes

gitlab-org/gitlab-ui (@​gitlab/ui)

v78.19.0

Compare Source

Features

• GlFormTextarea: add support for character count (1b359aa)

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