deps: Update actions/checkout digest to df4cb1c

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout (changelog)	action	digest	de0fac2 → df4cb1c

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[ANcpLua]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Chef's kiss.

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[ANcpLua]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

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[ANcpLua]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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