Pin max dask & distributed versions

[galipremsagar]

Changes to be in-line with: rapidsai/cudf#8859

[jakirkham]

rerun tests

[jakirkham]

rerun tests

[pentschev]

The failure is because CI still installs Dask/Distributed main branch, and there's now some changes in Distributed on UCX variable name changing that need to be resolved in Dask-CUDA. I opened #687 to avoid installing Dask from main branch and will revert that in 21.10 after that PR is merged.

[ajschmidt8]

rerun tests

[pentschev]

#687 is in, rerunning tests now.

[pentschev]

rerun tests

[codecov-commenter]

Codecov Report

Merging #686 (3765161) into branch-21.08 (14b8d63) will increase coverage by 29.90%.
The diff coverage is n/a.

❗ Current head 3765161 differs from pull request most recent head dc54b29. Consider uploading reports for the commit dc54b29 to get more accurate results

@@                Coverage Diff                @@
##           branch-21.08     #686       +/-   ##
=================================================
+ Coverage         60.19%   90.10%   +29.90%     
=================================================
  Files                21       15        -6     
  Lines              2618     1657      -961     
=================================================
- Hits               1576     1493       -83     
+ Misses             1042      164      -878     

Impacted Files	Coverage Δ
dask_cuda/benchmarks/local_cudf_merge.py
dask_cuda/benchmarks/local_cupy_map_overlap.py
dask_cuda/benchmarks/local_cudf_shuffle.py
dask_cuda/_version.py
dask_cuda/benchmarks/local_cupy.py
dask_cuda/benchmarks/utils.py
dask_cuda/explicit_comms/dataframe/shuffle.py	98.69% <0.00%> (+0.65%)	⬆️
dask_cuda/proxy_object.py	90.73% <0.00%> (+1.08%)	⬆️
dask_cuda/utils.py	88.58% <0.00%> (+1.31%)	⬆️
dask_cuda/cli/dask_cuda_worker.py	97.14% <0.00%> (+1.42%)	⬆️
... and 5 more

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[jakirkham]

@gpucibot merge