chore: prevent transform rgba() to #RGBA

[Dunqing]

fix: #5731

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-5739.surge.sh

[codecov]

Codecov Report

Base: 89.91% // Head: 89.91% // No change to project coverage 👍

Coverage data is based on head (fac93da) compared to base (d49a283).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5739   +/-   ##
=======================================
  Coverage   89.91%   89.91%           
=======================================
  Files         297      297           
  Lines        6339     6339           
  Branches     1554     1554           
=======================================
  Hits         5700     5700           
  Misses        590      590           
  Partials       49       49           

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