chore: update the change logs for #9712

changes/v5.0.14/fix-9712.en.md

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+Fixed the problem of '404 Not Found' when calling the HTTP API '/clients/:clientid/subscribe/bulk'
+from the plug-ins and data-bridges on handling the 'client.connected' event.

changes/v5.0.14/fix-9712.zh.md

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+修复了监听 `client.connected` 事件的插件和数据桥接在调用 `/clients/:clientid/subscribe/bulk`
+HTTP 接口时报 `404 Not Found` 的问题。