Update version of ONNX Runtime Web dists

[ibelem]

Got an error report that failed to execute 'gelu' on 'MLGraphBuilder': 1 argument required, but only 0 present when running Whisper Base demo by using ONNX Runtime Web stable version 1.18.0, so update version of ONNX Runtime Web dists for SD 1.5, SD Turbo and Whisper Base with following changes (SA will continue to use internal test version due to einsum):

• Get latest dev version of ONNX Runtime Web by default
• "ort" parameter in URL, WebNN demo, ORT Web and Chromium implementation developers can use following url parameter to change the version of ONNX Runtime Web
  • No ort="" parameter // get latest dev version of ONNX Runtime Web dists
  • ort=1.20.0-dev.20240810-6ae7e02d34 // Specify exact dev version from https://www.npmjs.com/package/onnxruntime-web?activeTab=versions
  • ort=test // Internal WebNN EP of ORT Web dists, usually including the patches which are not included in latest dev version

@Honry PTAL before sending to Dwayne for the review.

[ibelem]

@fdwr Please take a look for the ort dists version change. Thanks!

[fdwr]

FYI @Adele101. Merging since Honry also reviewed it.