Update dependency aws-sdk-sns to v1.91.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
aws-sdk-sns (source, changelog)	1.90.0 -> 1.91.0

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Release Notes

aws/aws-sdk-ruby (aws-sdk-sns)

### [`v1.91.0`](https://redirect.github.com/aws/aws-sdk-ruby/blob/HEAD/gems/aws-sdk-sns/CHANGELOG.md#1910-2024-11-18) - Feature - Code Generated Changes, see `./build_tools` or `aws-sdk-core`'s CHANGELOG.md for details.

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Configuration

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[github-actions[bot]]

Code Coverage Report: Only Changed Files listed

Package	Coverage
Overall Coverage	🟢 85%

Minimum allowed coverage is 0%, this run produced 85%