Unpin Dask versions now that 2021.3.1 has been released and fixes #482

[tomwhite]

Fixes#483

[tomwhite]

We can either merge this, or wait until the next Dask release with dask/dask#7335 in it.

[jeromekelleher]

Your call @tomwhite

[tomwhite]

Dask 2021.3.1 has been released, so we can unpin the Dask version and the build should work.

[tomwhite]

This just needs an approval now.

[codecov-io]

Codecov Report

Merging #484 (8809f5f) into master (cc57163) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #484 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 34 34 Lines 2642 2632 -10 =========================================
- Hits 2642 2632 -10 

Impacted Files	Coverage Δ
sgkit/variables.py	100.00% <0.00%> (ø)
sgkit/io/vcf/csi.py	100.00% <0.00%> (ø)
sgkit/io/vcf/tbi.py	100.00% <0.00%> (ø)
sgkit/io/vcf/vcf_reader.py	100.00% <0.00%> (ø)
sgkit/stats/association.py	100.00% <0.00%> (ø)

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[tomwhite]

Thanks Jerome.