docs: add changelog

changes/ce/feat-13492.en.md

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+The lists of actions and sources that depend on a given connector are now returned in the `GET /connectors` and `GET /connectors/:id` APIs.
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+The list of rules that depend on a given action or source is now returned in the `GET /actions`, `GET /sources`, `GET /actions/:id` and `GET /sources/:id` APIs.