fix: stepper

[jc9702507]

• 修改onChange

[github-actions]

🎊 PR Preview b8b649c has been successfully built and deployed to https://ant-design-ant-design-mini-preview-pr-795.surge.sh

🕐 Build time: 201.214s

_{🤖 By surge-preview}

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (653807e) 26.63% compared to head (b8b649c) 26.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #795   +/-   ##
=======================================
  Coverage   26.63%   26.63%           
=======================================
  Files         158      158           
  Lines        3312     3312           
  Branches      870      870           
=======================================
  Hits          882      882           
  Misses       2117     2117           
  Partials      313      313           

Impacted Files	Coverage Δ
src/Stepper/index.ts	100.00% <100.00%> (ø)

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