Pin max dask and distributed versions to 2021.09.1

[galipremsagar]

Changes to be in-line with: rapidsai/cudf#9286

[codecov-commenter]

Codecov Report

Merging #1841 (b27740c) into branch-21.10 (bf64c2c) will increase coverage by 9.72%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           branch-21.10    #1841      +/-   ##
================================================
+ Coverage         59.85%   69.57%   +9.72%     
================================================
  Files                77      139      +62     
  Lines              3547     8645    +5098     
================================================
+ Hits               2123     6015    +3892     
- Misses             1424     2630    +1206     

Impacted Files	Coverage Δ
python/cugraph/utilities/path_retrieval.py
python/cugraph/components/connectivity.py
python/cugraph/community/__init__.py
python/cugraph/dask/traversal/bfs.py
python/cugraph/layout/force_atlas2.py
python/cugraph/cores/__init__.py
python/cugraph/proto/components/scc.py
python/cugraph/linear_assignment/__init__.py
...ph/structure/graph_implementation/npartiteGraph.py
python/cugraph/traversal/traveling_salesperson.py
... and 206 more

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[ajschmidt8]

@gpucibot merge