Temporarily restrict dask version in CI (#807)

Author: jrbourbeau

ci/environment-3.7.yaml

@@ -6,9 +6,12 @@ dependencies:
   - black==19.10b0
   - coverage
   - codecov
-  - dask
+  # dask 2021.3.0 introduced a regression which causes tests to fail.
+  # The issue has been resolved upstream in dask and will be included
+  # in the next release. We temporarily apply a dask version contraint
+  # to allow CI to pass
+  - dask !=2021.3.0
   - dask-glm >=0.2.0
-  - distributed
   - flake8
   - isort==4.3.21
   - multipledispatch >=0.4.9

ci/environment-3.8.yaml

@@ -6,9 +6,12 @@ dependencies:
   - black==19.10b0
   - coverage
   - codecov
-  - dask
+  # dask 2021.3.0 introduced a regression which causes tests to fail.
+  # The issue has been resolved upstream in dask and will be included
+  # in the next release. We temporarily apply a dask version contraint
+  # to allow CI to pass
+  - dask !=2021.3.0
   - dask-glm >=0.2.0
-  - distributed
   - flake8
   - isort==4.3.21
   - multipledispatch >=0.4.9

ci/environment-docs.yaml

@@ -38,9 +38,12 @@ dependencies:
   - xgboost
   - zict
   - pip
-  - dask
+  # dask 2021.3.0 introduced a regression which causes tests to fail.
+  # The issue has been resolved upstream in dask and will be included
+  # in the next release. We temporarily apply a dask version contraint
+  # to allow CI to pass
+  - dask !=2021.3.0
   - dask-glm
-  - distributed
   - dask-xgboost
   - pip:
     - dask_sphinx_theme >=1.1.0