Merge pull request #296 from c-bata/hotfix-dask-workflow

[hotfix] Add the version constraint on dask

Author: y0z

.github/workflows/dask.yml

@@ -27,6 +27,8 @@ jobs:
         python -m pip install --upgrade pip
         pip install --progress-bar off -U setuptools
         pip install git+https://github.com/optuna/optuna.git
+        # TODO(c-bata): Remove the version constraint after dask-ml supports dask 2025.1.0
+        pip install "dask<2025.1.0"
         python -c 'import optuna'
         pip install git+https://github.com/optuna/optuna-integration.git
         python -c 'import optuna_integration'