fix: Loosen threshold for dpo functional test (#344)

Signed-off-by: ashors1 <ashors@nvidia.com>

Author: ashors1

tests/functional/dpo.sh

@@ -36,5 +36,5 @@ uv run $PROJECT_ROOT/examples/run_dpo.py \
 uv run tests/json_dump_tb_logs.py $LOG_DIR --output_path $JSON_METRICS
 
 uv run tests/check_metrics.py $JSON_METRICS \
-  'data["train/loss"]["3"] < 0.68'
+  'data["train/loss"]["3"] < 0.73'