Fix random test failure due to catboost bug

https://github.com/catboost/catboost/issues/2195

freqtrade/freqai/prediction_models/CatboostClassifier.py

@@ -1,4 +1,5 @@
 import logging
+import sys
 from pathlib import Path
 from typing import Any, Dict
 
@@ -48,6 +49,7 @@ class CatboostClassifier(BaseClassifierModel):
 
         init_model = self.get_init_model(dk.pair)
 
-        cbr.fit(X=train_data, eval_set=test_data, init_model=init_model)
+        cbr.fit(X=train_data, eval_set=test_data, init_model=init_model,
+                log_cout=sys.stdout, log_cerr=sys.stderr)
 
         return cbr

freqtrade/freqai/prediction_models/CatboostRegressor.py

@@ -1,4 +1,5 @@
 import logging
+import sys
 from pathlib import Path
 from typing import Any, Dict
 
@@ -47,6 +48,7 @@ class CatboostRegressor(BaseRegressionModel):
             **self.model_training_parameters,
         )
 
-        model.fit(X=train_data, eval_set=test_data, init_model=init_model)
+        model.fit(X=train_data, eval_set=test_data, init_model=init_model,
+                  log_cout=sys.stdout, log_cerr=sys.stderr)
 
         return model