chore(deps): update actions/checkout action to v6

[renovate-for-cybozu-oss]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v4 → v6

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Release Notes

actions/checkout (actions/checkout)

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

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

v6

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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

v5.0.1

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

v5.0.0

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• Update actions checkout to use node 24 by @​salmanmkc in #​2226

v5

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

v4.3.1

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• Port v6 cleanup to v4 by @​ericsciple in #​2305

v4.3.0

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• docs: update README.md by @​motss in #​1971
• Add internal repos for checking out multiple repositories by @​mouismail in #​1977
• Documentation update - add recommended permissions to Readme by @​benwells in #​2043
• Adjust positioning of user email note and permissions heading by @​joshmgross in #​2044
• Update README.md by @​nebuk89 in #​2194
• Update CODEOWNERS for actions by @​TingluoHuang in #​2224
• Update package dependencies by @​salmanmkc in #​2236

v4.2.2

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• url-helper.ts now leverages well-known environment variables by @​jww3 in #​1941
• Expand unit test coverage for isGhes by @​jww3 in #​1946

v4.2.1

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• Check out other refs/* by commit if provided, fall back to ref by @​orhantoy in #​1924

v4.2.0

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• Add Ref and Commit outputs by @​lucacome in #​1180
• Dependency updates by @​dependabot- #​1777, #​1872

v4.1.7

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• Bump the minor-npm-dependencies group across 1 directory with 4 updates by @​dependabot in #​1739
• Bump actions/checkout from 3 to 4 by @​dependabot in #​1697
• Check out other refs/* by commit by @​orhantoy in #​1774
• Pin actions/checkout's own workflows to a known, good, stable version. by @​jww3 in #​1776

v4.1.6

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• Check platform to set archive extension appropriately by @​cory-miller in #​1732

v4.1.5

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• Update NPM dependencies by @​cory-miller in #​1703
• Bump github/codeql-action from 2 to 3 by @​dependabot in #​1694
• Bump actions/setup-node from 1 to 4 by @​dependabot in #​1696
• Bump actions/upload-artifact from 2 to 4 by @​dependabot in #​1695
• README: Suggest user.email to be 41898282+github-actions[bot]@​users.noreply.github.com by @​cory-miller in #​1707

v4.1.4

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• Disable extensions.worktreeConfig when disabling sparse-checkout by @​jww3 in #​1692
• Add dependabot config by @​cory-miller in #​1688
• Bump the minor-actions-dependencies group with 2 updates by @​dependabot in #​1693
• Bump word-wrap from 1.2.3 to 1.2.5 by @​dependabot in #​1643

v4.1.3

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• Check git version before attempting to disable sparse-checkout by @​jww3 in #​1656
• Add SSH user parameter by @​cory-miller in #​1685
• Update actions/checkout version in update-main-version.yml by @​jww3 in #​1650

v4.1.2

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• Fix: Disable sparse checkout whenever sparse-checkout option is not present @​dscho in #​1598

v4.1.1

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• Correct link to GitHub Docs by @​peterbe in #​1511
• Link to release page from what's new section by @​cory-miller in #​1514

v4.1.0

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• Add support for partial checkout filters

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