Configurable Storybook port

See merge request gitlab-org/gitlab-ui!4994



Merged-by: Mark Florian <mflorian@gitlab.com>
Approved-by: Miguel Rincon <mrincon@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Reviewed-by: Mark Florian <mflorian@gitlab.com>

Replace `focus:!gl-shadow-inner-2-blue-400` with `focus:!gl-focus-inset`

fix(GlCollapsibleListbox): fix button focus ring color in dark mode

See merge request gitlab-org/gitlab-ui!4996



Merged-by: Mark Florian <mflorian@gitlab.com>
Approved-by: Dan MH <dmizzi-harris@gitlab.com>
Approved-by: Mark Florian <mflorian@gitlab.com>
Co-authored-by: sdejonge <sdejonge@gitlab.com>

## [108.9.1](gitlab-org/gitlab-ui@v108.9.0...v108.9.1) (2025-03-03)

### Bug Fixes

* **GlCollapsibleListbox:** fix button focus ring color in dark mode ([2f2bfdcb](gitlab-org/gitlab-ui@2f2bfdcb))