fix: get item for final score

Signed-off-by: Avik Basu <[email protected]>

numalogic/udfs/postprocess.py

@@ -158,7 +158,7 @@ def exec(self, keys: list[str], datum: Datum) -> Messages:
  pipeline_id=payload.pipeline_id,
  composite_keys=payload.composite_keys,
  timestamp=payload.end_ts,
- unified_anomaly=anomaly_score,
+ unified_anomaly=anomaly_score.item(),
  data=self._per_feature_score(payload.metrics, anomaly_scores),
  metadata=payload.metadata,
  )