[REVIEW] Specify branches to avoid pip resolver issue

[wphicks]

Avoid dependency resolution failure in latest version of pip by explicitly specifying versions for dask and distributed

Resolve #3210

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[jakirkham]

Would grab these 2 as well

cuml/ci/gpu/build.sh

Lines 73 to 74 in 4a0e67a

	pip install "git+https://github.com/dask/distributed.git" --upgrade --no-deps
	pip install "git+https://github.com/dask/dask.git" --upgrade --no-deps

[codecov-io]

Codecov Report

Merging #3218 (b89a9ef) into branch-0.17 (13600f7) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.17    #3218      +/-   ##
===============================================
- Coverage        71.00%   70.99%   -0.01%     
===============================================
  Files              198      198              
  Lines            15750    15729      -21     
===============================================
- Hits             11183    11167      -16     
+ Misses            4567     4562       -5     

Impacted Files	Coverage Δ
python/cuml/decomposition/pca.pyx	92.19% <0.00%> (-1.52%)	⬇️
python/cuml/common/input_utils.py	92.53% <0.00%> (-0.77%)	⬇️
...cuml/experimental/decomposition/incremental_pca.py	86.66% <0.00%> (-0.09%)	⬇️
python/cuml/thirdparty_adapters/adapters.py	88.55% <0.00%> (ø)
.../dask/feature_extraction/text/tfidf_transformer.py	43.54% <0.00%> (ø)
...ython/cuml/dask/neighbors/kneighbors_classifier.py	22.00% <0.00%> (+0.70%)	⬆️
python/cuml/dask/neighbors/kneighbors_regressor.py	31.25% <0.00%> (+1.39%)	⬆️

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