Migrate remaining font weight bold utils to Tailwind
What does this MR do and why?
Related #456641 (closed)
This migrates 2 instances of gl-font-weight-bold to gl-font-bold, which slipped into master in between the different migration MRs like 1, 2, and 3.
MR acceptance checklist
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Screenshots or screen recordings
gl-font-bold in app/assets/javascripts/members/components/table/role_selector.vue
