Update regions and voices used by Amazon Polly

[jschlyter]

Proposed change

Update list of Amazon Polly regions and voices.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
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• Link to frontend pull request:

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[jschlyter]

I'm not sure why the tests fails, but it seems unrelated to this PR.