chore: fix demos image url

[yutingzhao1991]

换了一个可用的 CDN 地址。

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 12, 2025 8:04am

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Latest commit: 3001ef8

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (cd5baa8) to head (3001ef8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1433   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          874       874           
  Lines        18766     18766           
  Branches      1686      1686           
=========================================
  Hits         18766     18766           

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