fix(GlListBox): allow item.value to be a number

mentioned in commit baed3806

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!116 (merged)

mentioned in merge request status-page!681 (merged)

mentioned in merge request gitlab!109394 (closed)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!117 (merged)

mentioned in merge request status-page!682 (merged)

mentioned in merge request gitlab!109505 (closed)

mentioned in merge request gitlab-docs!3462 (merged)

mentioned in merge request gitlab-docs!3463 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3220 (merged)

mentioned in merge request gitlab!109285 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3231 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3232 (merged)