Update emsdk 8.0.13
- Updated NuGet.config - emsdk feed
- Updated Versions.props - emsdk 8.0.13
- Updated Version.Details.xml - update emsdk 8.0.13

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#### AI description  (iteration 1)
#### PR Classification
Dependency update

#### PR Summary
This pull request updates the Emscripten SDK to version 8.0.13.
- Updated `Microsoft.NET.Workload.Emscripten.Current.Manifest-8.0.100` and `Microsoft.SourceBuild.Intermediate.emsdk` versions in `/eng/Version.Details.xml`.
- Updated NuGet package source keys in `/NuGet.config`.
- Updated `MicrosoftNETWorkloadEmscriptenCurrentManifest80100PackageVersion` in `/eng/Versions.props`.