chore(deps): update valkey/valkey docker digest to 4963247

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
valkey/valkey	service	digest	c6d4637 → 4963247

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Summary by CodeRabbit

• Chores
  • CIのバックエンドテストで使用するRedis（Valkey）のコンテナイメージ参照を更新しました。ワークフローの他の設定には変更がなく、テスト実行時に異なるValkeyコンテナイメージが起動されます。

[cloudflare-workers-and-pages]

Deploying koyori with    Cloudflare Pages

Latest commit:	35b208d
Status:	⚡️  Build in progress...

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Reviewing files that changed from the base of the PR and between 3be3c02 and 2268728.

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• .github/workflows/backend-test.yml

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Walkthrough

GitHub Actions のバックエンドテストワークフローで、jobs.test.services.redis.image に指定された Valkey（Redis互換）コンテナイメージの SHA256 ピン留めを別のダイジェスト値へ更新しました。ワークフローの他の設定に変更はありません。

Changes

CI インフラストラクチャ

Layer / File(s)	Summary
Valkey コンテナイメージのピン留め更新 .github/workflows/backend-test.yml	jobs.test.services.redis.image の SHA256 ダイジェストを更新し、テスト環境で起動される Valkey コンテナイメージを差し替えました。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 新しいダイジェストが風に舞う
小さな変更で準備は整う
CI の朝にコンテナが走る
テストは静かに扉を開ける
さあ、ビルドよ、よく頑張ったね

🚥 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は、Valkey Dockerイメージのダイジェスト更新という変更内容を正確に反映しており、主な変更を明確に要約しています。
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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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 @.github/workflows/backend-test.yml:
- Line 41: The workflow references the pinned image "image:
valkey/valkey@sha256:4963247afc4cd33c7d3b2d2816b9f7f8eeebab148d29056c2ca4d7cbc966f2d9";
confirm in the workflow that this digest is intentionally pinned (keep the
digest) and add a short inline comment noting the digest is valid for the
9.1.0-trixie multi-arch tag, then add a CI step invoking a vulnerability scanner
(e.g., Trivy or Grype) after image pull to scan the full container including OS
layers so container-wide CVEs are reported; ensure the new step references the
same pinned image string so scanning and execution use the identical artifact.

🪄 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

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Review profile: ASSERTIVE

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Run ID: 580c8ae3-c874-4e07-a067-17bb47c3da9e

📥 Commits

Reviewing files that changed from the base of the PR and between 2fac2b5 and 6a9625f.

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• .github/workflows/backend-test.yml