chore(site): update unit test badge

[anlyyao]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.63%. Comparing base (02b774b) to head (88de82b).
⚠️ Report is 355 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #841       +/-   ##
============================================
+ Coverage     6.93%   56.63%   +49.70%     
============================================
  Files          400      287      -113     
  Lines         4241     7296     +3055     
  Branches       990     1980      +990     
============================================
+ Hits           294     4132     +3838     
+ Misses        3947     3164      -783     

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[pkg-pr-new]

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npm i https://pkg.pr.new/tdesign-mobile-react@841

commit: 88de82b

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