Updated SourceBuildPrebuiltBaseline.xml -
Microsoft.Build.17.10.21
Microsoft.Build.Framework.17.10.21
Microsoft.Build.Utilities.Core.17.10.21
Microsoft.NET.StringTools.17.10.21
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#### AI description (iteration 1)
#### PR Classification
Documentation update.
#### PR Summary
Updated the `SourceBuildPrebuiltBaseline.xml` to include new versions of specific packages.
- `SourceBuildPrebuiltBaseline.xml`: Added `Microsoft.Build*/17.10.21` and `Microsoft.NET.StringTools/17.10.21` to the allowed usage patterns.
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