Update module github.com/alecthomas/kong to v0.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/alecthomas/kong	v0.8.1 -> v0.9.0

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Release Notes

alecthomas/kong (github.com/alecthomas/kong)

### [`v0.9.0`](https://togithub.com/alecthomas/kong/compare/v0.8.1...v0.9.0) [Compare Source](https://togithub.com/alecthomas/kong/compare/v0.8.1...v0.9.0)

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Configuration

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🚦 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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