chore: changelog for #9748

changes/v5.0.15/fix-9748-en.md

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+Listeners not configured with `max_connections` will cause the cluster `/listeners` API to return 500 error.

changes/v5.0.15/fix-9748-zh.md

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+监听器不配置 `max_connections` 时会导致集群 `/listeners` 接口返回 500 错误。