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`CronClient.update` / `SyncCronClient.update` stripped all `None`-valued fields from the PATCH body, so `update(end_time=None)` could never clear a previously set cron end time. This routes an explicit `None` through as `end_time: null` (via the existing `NOT_PROVIDED` sentinel), while an omitted argument still leaves the value unchanged. Verified with `make format`, `make lint`, and `make test` in `libs/sdk-py` (493 passed), including two new tests asserting the PATCH body carries an explicit null `end_time`.