These models require cross-region inference, and it currently fails if
you try to use them:
```
Invocation of model ID anthropic.claude-sonnet-4-20250514-v1:0 with on-demand throughput isn’t supported. 
```

Release Notes:

- Enable cross-region inference for Claude 4 family models on Amazon
Bedrock provider

Signed-off-by: Burak Varlı <burakvar@amazon.co.uk>