chore(deps): bump actions/checkout from v5 to v6.0.3

[benjih]

Changelog

v6.0.3

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

v6.0.2

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

v6.0.1

• Add worktree support for persist-credentials includeIf by @ericsciple in Add worktree support for persist-credentials includeIf actions/checkout#2327

v6.0.0

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

v5.0.1

• Port v6 cleanup to v5 by @ericsciple in Port v6 cleanup to v5 actions/checkout#2301