chore(deps): update actions/checkout digest to b4ffde6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	3df4ab1 -> b4ffde6

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[github-actions[bot]]

🏷️ [bumpr] Next version:v1.12.1 Changes:v1.12.0...reviewdog:renovate/actions-checkout-digest