Update cirrus-actions/rebase action to v1.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
cirrus-actions/rebase	action	minor	1.5 -> 1.6

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Release Notes

cirrus-actions/rebase

### [`v1.6`](https://togithub.com/cirrus-actions/rebase/releases/1.6) [Compare Source](https://togithub.com/cirrus-actions/rebase/compare/1.5...1.6) #### What's Changed - Bump `@1.4` to `@1.5` in README by [@​cranberryofdoom](https://togithub.com/cranberryofdoom) in [https://github.com/cirrus-actions/rebase/pull/87](https://togithub.com/cirrus-actions/rebase/pull/87) - Unbreak rebase following [actions/checkout#​766](https://togithub.com/actions/checkout/issues/766). by [@​fischman-bcny](https://togithub.com/fischman-bcny) in [https://github.com/cirrus-actions/rebase/pull/94](https://togithub.com/cirrus-actions/rebase/pull/94) #### New Contributors - [@​cranberryofdoom](https://togithub.com/cranberryofdoom) made their first contribution in [https://github.com/cirrus-actions/rebase/pull/87](https://togithub.com/cirrus-actions/rebase/pull/87) - [@​fischman-bcny](https://togithub.com/fischman-bcny) made their first contribution in [https://github.com/cirrus-actions/rebase/pull/94](https://togithub.com/cirrus-actions/rebase/pull/94) **Full Changelog**: https://github.com/cirrus-actions/rebase/compare/1.5...1.6

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Configuration

📅 Schedule: 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, click this checkbox.

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