Accessibility: Tablists do not have accessible name

[kburk1997]

Describe the bug

1. Go to Redocly demo
2. Go to "POST /pet" sample
3. Inspect "Request samples" tablist
4. Open Chrome DevTools accessibility tree
5. Observe that tablist does not have accessible name (see "Screenshots").

Expected behavior
Each tablist should have an accessible name. Ideally, the tablist should be labelled by the heading above it (using aria-labelledby).

Screenshots

Additional context
ARIA Practices Guide - Tabs - Manual Example