Update dependency com.amazonaws:aws-java-sdk-bom to v1.12.776

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.amazonaws:aws-java-sdk-bom (source)	1.12.775 -> 1.12.776

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Release Notes

aws/aws-sdk-java (com.amazonaws:aws-java-sdk-bom)

### [`v1.12.776`](https://redirect.github.com/aws/aws-sdk-java/compare/1.12.775...1.12.776) [Compare Source](https://redirect.github.com/aws/aws-sdk-java/compare/1.12.775...1.12.776)

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Configuration

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, 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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