[ja] Update content/ja/docs/concepts/workloads/pods/sidecar-containers.md

[kfess]

Description

Updated Japanese translation: content/ja/docs/concepts/workloads/pods/sidecar-containers.md.

Website Link:

• Japanese: https://kubernetes.io/ja/docs/concepts/workloads/pods/sidecar-containers/
• English: https://kubernetes.io/docs/concepts/workloads/pods/sidecar-containers/

Issue

Closes: #53632

/area localization /language ja