fix(comp:breadcrumb): modify breadcrumb fontSize to fontSizeMd

[sallerli1]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

What is the current behavior?

面包屑的字体大小不正确

What is the new behavior?

修改为fontSizeMd

Other information

[idux-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (b122426) to head (b9baa07).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1893   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files         359      359           
  Lines       35248    35248           
  Branches     2806     2807    +1     
=======================================
  Hits        32001    32001           
  Misses       3247     3247           

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