Fixing #11005: Incorrect max_tokens in yaml file for AWS Bedrock US Cross Region Inference version of 3.5 Sonnet v2 and 3.5 Haiku

[kazuhisa-wada]

Summary

This PR Fixes #11005 .
This is to fix maximum number of configurable Max Tokens on model configuration UI for the case: bedrock claude 3.5 sonnet v2 cross region and claude 3.5 haiku cross region.

Those number right now is 4096, To-Be is 8192.

Screenshots

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Checklist

Important

Please review the checklist below before submitting your pull request.

NA as this is just to change the yaml file for UI displaying.
As clarified in previous section, yaml fixes where reflected to UI expectedly where I confirmed chat application worked as expected for both of Cross Region bedrock claude 3.5 sonnet v2 cross region/cladue 3.5 haiku cross region.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods