Update actions/checkout action to v6.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v6.0.0 → v6.1.0

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Release Notes

actions/checkout (actions/checkout)

v6.1.0

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v6.0.3

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• Fix checkout init for SHA-256 repositories by @​yaananth in #​2439
• fix: expand merge commit SHA regex and add SHA-256 test cases by @​yaananth in #​2414

v6.0.2

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• Fix tag handling: preserve annotations and explicit fetch-tags by @​ericsciple in #​2356

v6.0.1

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• Add worktree support for persist-credentials includeIf by @​ericsciple in #​2327

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