Update module github.com/aws/smithy-go to v1.20.4 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/aws/smithy-go	v1.20.3 -> v1.20.4

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Release Notes

aws/smithy-go (github.com/aws/smithy-go)

### [`v1.20.4`](https://togithub.com/aws/smithy-go/compare/v1.20.3...v1.20.4) [Compare Source](https://togithub.com/aws/smithy-go/compare/v1.20.3...v1.20.4)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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