chore: update changes

changes/v5.0.15/fix-9787.en.md

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+Fix a compatible problem for the `webhook` bridge configuration which was created before the v5.0.12.

changes/v5.0.15/fix-9787.zh.md

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+修复对在 v5.0.12 之前创建的 `webhook` 桥接配置的兼容问题。