chore: update the changelog

changes/v5.0.14/feat-9675.en.md

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+HTTP client library `ehttpc` upgraded from `0.4.2` to `0.4.3`.
+Library `eredis_cluster` which manages clients to redis clusters upgraded from `0.7.1` to `0.7.5`.

changes/v5.0.14/feat-9675.zh.md

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+HTTP 客户端库 `ehttpc` 从 `0.4.2` 升级到 `0.4.3`
+Redis cluster 客户端库 `eredis_cluster` 从 `0.7.1` 升级到 `0.7.5`.