Update for change in Zarr checksum format

[jwodder]

To accompany dandi/dandi-schema#120

Cannot be tested until after dandischema 0.6.0 is released (and then further edits will be needed to update some test cases that hardcode checksums).

[codecov]

Codecov Report

Merging #933 (69f9326) into master (a941ab4) will decrease coverage by 0.05%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master     #933      +/-   ##
==========================================
- Coverage   87.40%   87.35%   -0.06%     
==========================================
  Files          62       62              
  Lines        7695     7688       -7     
==========================================
- Hits         6726     6716      -10     
- Misses        969      972       +3     

Flag	Coverage Δ
unittests	87.35% <90.32%> (-0.06%)	⬇️

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Impacted Files	Coverage Δ
dandi/files.py	79.44% <0.00%> (ø)
dandi/cli/tests/test_digest.py	100.00% <100.00%> (ø)
dandi/support/digests.py	100.00% <100.00%> (ø)
dandi/support/tests/test_digests.py	100.00% <100.00%> (ø)
dandi/dandiarchive.py	83.68% <0.00%> (-1.68%)	⬇️
dandi/download.py	87.11% <0.00%> (+0.17%)	⬆️

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[yarikoptic]

0.6.0 was released, so time to "test"/merge/release asap @jwodder ?

[jwodder]

@yarikoptic I already updated the tests. The release should include #938 as well.

[yarikoptic]

#938 is already merged, so let's proceed with merge/release of this one