fix(Image): mismatching warning during ssr

[chenjiahan]

#7721

[github-actions]

🎊 PR Preview 67e4adb has been successfully built and deployed to https://youzan-vant-preview-pr-7822.surge.sh

🕐 Build time: 106.463s

_{🤖 By surge-preview}

[codecov-io]

Codecov Report

Merging #7822 (3ea84ad) into 2.x (97509a9) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              2.x    #7822      +/-   ##
==========================================
+ Coverage   91.01%   91.02%   +0.01%     
==========================================
  Files         182      182              
  Lines        5030     5037       +7     
  Branches      295      295              
==========================================
+ Hits         4578     4585       +7     
  Misses        417      417              
  Partials       35       35              

Impacted Files	Coverage Δ
src/image/index.js	100.00% <100.00%> (ø)
src/stepper/index.js	97.87% <0.00%> (+0.04%)	⬆️
src/swipe-item/index.js	96.00% <0.00%> (+0.16%)	⬆️
src/swipe/index.js	91.66% <0.00%> (+0.23%)	⬆️

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