chore: add Renovate configuration

[Yusuke4869]

Summary by CodeRabbit

リリースノート

• Chores
  • 依存関係の自動更新ツールの設定を追加しました。Deno向けの設定を適用して、プロジェクト管理を強化しました。

[coderabbitai]

📝 Walkthrough

Walkthrough

renovate.json を新規追加し、Renovateのスキーマ URL と Deno 向け共有設定 (github>Yusuke4869/renovate-config:deno) を extends フィールドで参照する構成を定義した。

Changes

Renovate設定の追加

Layer / File(s)	Summary
renovate.json 新規追加 renovate.json	$schema と extends フィールドを持つ renovate.json を追加し、Deno向け共有設定 (github>Yusuke4869/renovate-config:deno) を参照する構成を定義。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 うさぎのうた

新しいファイル、ぴょんと登場
Renovate さんへ、設定を渡す
Deno の道も、これで安心
依存関係よ、いつも新鮮に ✨
うさぎはにっこり、跳ねていくよ！

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	プルリクエストのタイトル「chore: add Renovate configuration」は、renovate.jsonファイルの追加という主な変更内容を正確に反映しており、簡潔で明確です。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/renovate-config

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@renovate.json`:
- Around line 1-4: The referenced external Renovate configuration repository in
the extends field does not exist. Update the extends array in renovate.json to
replace the non-existent github>Yusuke4869/renovate-config:deno reference with
the correct and commonly-used github>Omochice/renovate-config:deno configuration
for Deno projects.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 75e15b4f-9f3f-4cdf-836d-422dc4242f79

📥 Commits

Reviewing files that changed from the base of the PR and between 39e0128 and 948b8cf.

📒 Files selected for processing (1)

• renovate.json