Add last header cell class

[afc163]

ant-design/ant-design#20030

[vercel]

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(f4920f8, update in progress)

[codecov]

Codecov Report

Merging #390 into 6.x will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             6.x    #390   +/-   ##
=====================================
  Coverage   89.5%   89.5%           
=====================================
  Files         16      16           
  Lines        829     829           
  Branches     234     234           
=====================================
  Hits         742     742           
  Misses        87      87

Impacted Files	Coverage Δ
src/TableHeaderRow.tsx	96.29% <ø> (ø)	⬆️

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