Integration test config

[dchiquito]

These changes may possibly help resolve dandi/dandi-archive#567.

• Limit celery concurrency to 1. Possibly having multiple workers running at the same time is causing a race condition.
• Upgrade the minio image version. The error might be happening when querying the minio container from the celery container, so possibly there is a minio bug that has been patched in the last 4 months.

[codecov]

Codecov Report

Merging #957 (eb32c4b) into master (acc312c) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #957      +/-   ##
==========================================
+ Coverage   87.28%   87.33%   +0.04%     
==========================================
  Files          65       65              
  Lines        8099     8099              
==========================================
+ Hits         7069     7073       +4     
+ Misses       1030     1026       -4     

Flag	Coverage Δ
unittests	87.33% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dandi/utils.py	81.26% <0.00%> (+0.31%)	⬆️
dandi/tests/skip.py	89.06% <0.00%> (+4.68%)	⬆️

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[github-actions]

🚀 PR was released in 0.39.0 🚀