chore(deps): update dependency @gitlab/ui to v29.8.0

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	29.7.4 -> 29.8.0

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

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Release Notes

gitlab-org/gitlab-ui

v29.8.0

Compare Source

Features

• GlTabs: Add horizontal scrolling interaction (0bd52e9)

29.7.4 (2021-04-20)

Bug Fixes

• GlTabs: Update hover state bottom border color (09aa059)

29.7.3 (2021-04-16)

Bug Fixes

• deps: upgrade BootstrapVue to v2.14.0 (e721648)

29.7.2 (2021-04-15)

Bug Fixes

• Point Pajamas anchors to main branch (ad9f5aa)

29.7.1 (2021-04-15)

Bug Fixes

• Add and improve accessible names within components (28c9d07)

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