build(deps): update actions/checkout action to v6.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	patch	v6.0.2 → v6.0.3

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Release Notes

actions/checkout (actions/checkout)

v6.0.3

Compare Source

• 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

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[claude]

actions/checkout を v6.0.2 から v6.0.3 へ更新する Renovate のパッチ更新です。

• 変更内容は SHA-256 リポジトリ対応の修正 (actions/checkout#2439, actions/checkout#2414)。挙動を変える破壊的変更はありません。
• SHA pin df4cb1c069e1874edd31b4311f1884172cec0e10 が v6.0.3 タグの指すコミットと一致することを確認済みです。
• ルートおよび全テンプレート (basic, github-action, haskell-himari, typescript) の check.yml / release.yml 計 8 ファイルで一貫して更新されており、漏れはありません。

問題ありません。

Review metadata

• Reviewed commit: 7261dac
• PR: #207
• kyosei: 3.5.0
• kyosei-action: 2.2.0
• Claude Code: 2.1.150
• Model: claude-opus-4-7
• Execution: GitHub Actions (run)