Add release note for log change
#### <sub><sup><a name="4492" href="#4492">:link:</a></sup></sub> fix
* The `fly format-pipeline` now always produces a formatted pipeline, instead of declining to do so when it was already in the expected format. #4492
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+#### <sub><sup><a name="4606" href="#4606">:link:</a></sup></sub> feature
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+* @wagdav updated worker heartbeat log level from `debug` to `info` to reduce extraneous log output for operators #4606
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