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Fixes #12301
Assembly version is easy. File version is best effort, since I didn't see a better way to find the 'real' path to the output assembly than using the paths passed in when calling the task. I don't know if that's guaranteed to be complete, but it at least had what I needed in the simple case I was testing, and if it's missing, it should just not include it rather than failing.
Before:

After:

The app (12301.csproj in this case) has a ProjectReference to library. This adds the assembly version and file version to that reference in the deps.json.