Fix prophet test (Kaggle#1173)

The new version of prophet (1.1) introduced breaking changes to the fit
arguments.

http://b/237327883

Fix prophet test (Kaggle#1173)

The new version of prophet (1.1) introduced breaking changes to the fit
arguments.

http://b/237327883

Install onnx package (Kaggle#1170)

http://b/235510037

Install onnx package (Kaggle#1170)

http://b/235510037

Fix GIT_COMMIT environment variable (Kaggle#1165)

Fix GIT_COMMIT environment variable (Kaggle#1165)

Upgrade LightGBM (Kaggle#1158)

Upgrade LightGBM (Kaggle#1158)

Upgrade LightGBM (Kaggle#1158)

Upgrade LightGBM (Kaggle#1158)