fix: translations/ja-JP/content/actions/creating-actions/dockerfile-support-for-github-actions.md to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN9-DPKG-2847943
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356506
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356506
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356506
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356686

Author: snyk-bot

translations/ja-JP/content/actions/creating-actions/dockerfile-support-for-github-actions.md

@@ -67,7 +67,7 @@ ENTRYPOINT ["sh", "-c", "echo $GITHUB_SHA"]
 
 ```dockerfile
 # コードを実行するコンテナイメージ
-FROM debian:9.5-slim
+FROM debian:bookworm-20231009-slim
 
 # アクションのリポジトリからコードをコンテナのファイルシステムパス `/` にコピー
 COPY entrypoint.sh /entrypoint.sh