build(deps): bump actions/checkout from 4 to 6

dependabot[bot]

24.37.2026 5461db15a50e43a6c133fd573b77d7a2d4c2c5eb

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{
    "recommendations": [
        "pkief.material-icon-theme",
        "yzhang.markdown-all-in-one",
        "davidanson.vscode-markdownlint"
    ]
}