Pin Dask and Distributed <=2021.04.0

[pentschev]

No description provided.

[codecov-commenter]

Codecov Report

Merging #585 (6611a09) into branch-0.19 (01bace0) will increase coverage by 1.44%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.19     #585      +/-   ##
===============================================
+ Coverage        60.46%   61.91%   +1.44%     
===============================================
  Files               22       22              
  Lines             2628     2628              
===============================================
+ Hits              1589     1627      +38     
+ Misses            1039     1001      -38     

Impacted Files	Coverage Δ
dask_cuda/explicit_comms/dataframe/shuffle.py	97.94% <0.00%> (+0.68%)	⬆️
dask_cuda/utils.py	90.90% <0.00%> (+1.06%)	⬆️
dask_cuda/proxy_object.py	91.36% <0.00%> (+1.11%)	⬆️
dask_cuda/device_host_file.py	69.11% <0.00%> (+1.47%)	⬆️
dask_cuda/cli/dask_cuda_worker.py	96.96% <0.00%> (+1.51%)	⬆️
dask_cuda/initialize.py	92.59% <0.00%> (+3.70%)	⬆️
dask_cuda/proxify_device_objects.py	90.16% <0.00%> (+9.83%)	⬆️
dask_cuda/get_device_memory_objects.py	89.04% <0.00%> (+19.17%)	⬆️
dask_cuda/is_device_object.py	92.59% <0.00%> (+25.92%)	⬆️

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