[REVIEW] Unpin dask version on CI

[galipremsagar]

This PR will unpin dask versions that are fetched in CI.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-21.08@f31a094). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             branch-21.08    #8425   +/-   ##
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  Coverage                ?   82.83%           
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  Files                   ?      109           
  Lines                   ?    17901           
  Branches                ?        0           
===============================================
  Hits                    ?    14828           
  Misses                  ?     3073           
  Partials                ?        0           

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[jakirkham]

Should we fold this change into PR ( #8426 )?

[galipremsagar]

Should we fold this change into PR ( #8426 )?

we could, but then I'm not sure how long the dask upstream PR would take to be merged, so better to let our CI work using dask main branch irrespective of make_meta changes

[jakirkham]

@gpucibot merge