SIENTIAPDE-1182

Update requirements and modify MLFlow activity

- Bump sientia-mlops-library version in requirements.txt from 0.38.5 to 0.38.8.
- Comment out the reset_index call in the MLFlow activity to prevent unintended data manipulation.

laborious/activities/mlflow.py

@@ -58,7 +58,7 @@ class MLFlow(BaseActivity):
             index='timestamp', columns='variable',
             values='value')
         data.fillna(np.nan, inplace=True)
-        data.reset_index(inplace=True)
+        # data.reset_index(inplace=True)
         data.columns.name = None
 
         self.debug("Processed input data:", metadata)