fix(deps): update dependency snakecase-keys to v6 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
snakecase-keys	^5.5.0 -> ^6.0.0

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Release Notes

bendrucker/snakecase-keys (snakecase-keys)

### [`v6.0.0`](https://togithub.com/bendrucker/snakecase-keys/compare/v5.5.0...v6.0.0) [Compare Source](https://togithub.com/bendrucker/snakecase-keys/compare/v5.5.0...v6.0.0)

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Configuration

📅 Schedule: Branch creation - "before 4am on Monday" in timezone Asia/Tokyo, Automerge - "before 4am" in timezone Asia/Tokyo.

🚦 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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