build(github): update actions/checkout to v6.0.1

[ocfbot]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v5.0.0 -> v6.0.1

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Release Notes

actions/checkout (actions/checkout)

v6.0.1

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What's Changed

• Update all references from v5 and v4 to v6 by @​ericsciple in #​2314
• Add worktree support for persist-credentials includeIf by @​ericsciple in #​2327
• Clarify v6 README by @​ericsciple in #​2328

Full Changelog: actions/checkout@v6...v6.0.1

v6.0.0

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• Persist creds to a separate file by @​ericsciple in #​2286
• Update README to include Node.js 24 support details and requirements by @​salmanmkc in #​2248

v5.0.1

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• Port v6 cleanup to v5 by @​ericsciple in #​2301

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