Upgrade @gitlab/ui to v29.7.3

What does this MR do?

Integration branch for gitlab-ui!2150 (merged). Upgrades BootstrapVue to v2.14.0.

Package	Type	Update	Change
@gitlab/ui (source)	dependencies	minor	29.6.0 -> 29.7.3

Release Notes

gitlab-org/gitlab-ui

v29.7.3

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Bug Fixes

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

v29.7.2

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Bug Fixes

• Point Pajamas anchors to main branch (ad9f5aa)

v29.7.1

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Bug Fixes

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

v29.7.0

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Features

• Markdown: Style blockquote blocks (e541a7e)