Updates vsts-api-patcher to reflect valid use of 'Change'

[emagers]

Fixes issue #538

vsts-api-patcher is making the item property required when it is not valid for the Change returned by the commits search API. This causes a deserialization error because the API does not return the item property.

[tofay]

You'll also need to run build.sh or build.ps1 and commit the changes to the Rust API (azure_devops_rust_api folder)

[emagers]

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