chore: add role to clear button

[kerm1it]

fix ant-design/ant-design#30496

[vercel]

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🔍 Inspect: https://vercel.com/react-component/picker/64QSjjdEn9YZZ5McqAE6XYA3uohX
✅ Preview: https://picker-git-role-clear-button-react-component.vercel.app

[codecov]

Codecov Report

Merging #250 (1d7da21) into master (8bc4cce) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #250   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          45       45           
  Lines        2113     2113           
  Branches      622      614    -8     
=======================================
  Hits         2103     2103           
  Misses          8        8           
  Partials        2        2           

Impacted Files	Coverage Δ
src/Picker.tsx	100.00% <100.00%> (ø)

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