build(deps): lock file maintenance

[renovate]

This PR contains the following updates:

Update	Change
lockFileMaintenance	All locks refreshed

🔧 This Pull Request updates lock files to use the latest dependency versions.

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[claude]

renovateによるflake.lockのロックファイルメンテナンスPRです。

emacs-overlayとnixpkgsのロックを安定ブランチ/ローリングリリース内のリビジョン更新で引き上げているのみで、flake.nix側の入力制約(nixos-26.05など)に変更はありません。破壊的変更やセキュリティ上の懸念は確認されず、CIのnix-fast-buildチェックでビルド可能性が検証されます。

指摘は更新内容を補足するNOTEのみのため、APPROVEとします。

Review metadata

• Reviewed commit: c57f3ae
• PR: #93
• kyosei: 3.5.0
• kyosei-action: 2.2.5
• Claude Code: 2.1.174
• Model: claude-opus-4-8
• Execution: GitHub Actions (run)