feat: Update AWS Bedrock supported regions

[Retr0-01]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

This PR updates the list of supported AWS Bedrock regions in order to match the official documentation article.

Fixes #8991

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

N/A

[crazywoola]

Please rebase the main branch and push it again.

[Retr0-01]

I think this should do it @crazywoola. I was uncertain if you wanted me to sync from upstream/main or rebase and squash the PR commits so I went with the first option.

Please let me know if I misunderstood.