fix(tabs): add role="button" to tab for a11y

[yqrashawn]

Checklist

• Fix linting errors
• Label has been added

Change information

Add role="button" to tabs, vercel style has the role attribute. This also make vimium recognize the tab.

By the way, what does the "Label has been added" checkbox mean?

[codecov]

Codecov Report

Merging #308 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #308   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files         186      186           
  Lines        2373     2373           
  Branches      568      568           
=======================================
  Hits         2372     2372           
  Misses          1        1           

Impacted Files	Coverage Δ
components/tabs/tabs.tsx	100.00% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c51e158...f28a607. Read the comment docs.

[unix]

Thanks. 🎉
"label" means the label of PR, it was originally used for internal development, but now it seems unnecessary. I will improve the content of the pull-request template.