Ollama ChatClientIntegrationTests.CompleteAsync_StructuredOutputEnum fails locally

[stephentoub]

 Microsoft.Extensions.AI.OllamaChatClientIntegrationTests.CompleteAsync_StructuredOutputEnum

  Message: 
Assert.Equal() Failure: Values differ
Expected: Arm64
Actual:   Arm

  Stack Trace: 
ChatClientIntegrationTests.CompleteAsync_StructuredOutputEnum() line 665
--- End of stack trace from previous location ---

cc: @SteveSandersonMS