fix(comp:alert): modify warning icon to 'exclamation-circle'

[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?

warning类型的alert图标不正确，应当为 exclamation-circle

What is the new behavior?

修复以上问题

Other information

[idux-bot]

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[codecov]

Codecov Report

Merging #1676 (7039ac7) into main (dc97ac1) will not change coverage.
Report is 4 commits behind head on main.
The diff coverage is 100.00%.

❗ Current head 7039ac7 differs from pull request most recent head 696211b. Consider uploading reports for the commit 696211b to get more accurate results

@@           Coverage Diff           @@
##             main    #1676   +/-   ##
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  Coverage   92.59%   92.59%           
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  Files         345      345           
  Lines       32285    32285           
  Branches     3688     3687    -1     
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  Hits        29895    29895           
  Misses       2390     2390           

Files Changed	Coverage Δ
packages/components/config/src/defaultConfig.ts	100.00% <100.00%> (ø)