build(deps): update keptn/gh-automation action to v1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
keptn/gh-automation	action	minor	v1.5.2 -> v1.6.0

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Release Notes

keptn/gh-automation (keptn/gh-automation)

### [`v1.6.0`](https://togithub.com/keptn/gh-automation/releases/tag/v1.6.0) [Compare Source](https://togithub.com/keptn/gh-automation/compare/v1.5.3...v1.6.0) ##### [1.6.0](https://togithub.com/keptn/gh-automation/compare/v1.5.3...v1.6.0) (2022-07-06) ##### Features - Add Helm chart build action ([#​21](https://togithub.com/keptn/gh-automation/issues/21)) ([1425fd1](https://togithub.com/keptn/gh-automation/commit/1425fd1d1ed25ff173ca29c59268e730a4296300)) ### [`v1.5.3`](https://togithub.com/keptn/gh-automation/releases/tag/v1.5.3) [Compare Source](https://togithub.com/keptn/gh-automation/compare/v1.5.2...v1.5.3) ##### [1.5.3](https://togithub.com/keptn/gh-automation/compare/v1.5.2...v1.5.3) (2022-04-28) ##### Bug Fixes - Set only image name as lowercase, leave image tag untouched ([#​20](https://togithub.com/keptn/gh-automation/issues/20))

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Configuration

📅 Schedule: Branch creation - "after 10pm on Wednesday,before 8am on Thursday" in timezone Europe/Vienna, 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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