anthropic: Reorder `Model` variants in descending order (#32689)

This PR reorders the `Model` variants in the `anthropic` crate in
descending order.

Newer/more powerful models at the top -> older/less powerful models at
the bottom.

Release Notes:

- N/A
fcf5042007Marshall Bowers committed on 6/13/2025, 2:01:32 PM· committed by GitHubparentcb9beb8
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