Replace resolved numpy workaround with dask workaround

[glatterf42]

This is a twin of iiasa/message_ix#887, fixing the CI test suite by pinning dask until genno is compatible with the latest versions of it.

• Read the diff and note that the CI checks all pass.

PR checklist

• Continuous integration checks all ✅
• Update CI tests; coverage checks both ✅
• [ ] Add, expand, or update documentation. Just CI.
• [ ] Update doc/whatsnew. Just CI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.5%. Comparing base (0645fd5) to head (a71d060).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #245     +/-   ##
=======================================
- Coverage   76.5%   75.5%   -1.0%     
=======================================
  Files        203     203             
  Lines      15546   15546             
=======================================
- Hits       11896   11748    -148     
- Misses      3650    3798    +148     

Files with missing lines	Coverage Δ
message_ix_models/model/water/data/demands.py	78.4% <100.0%> (ø)

... and 7 files with indirect coverage changes

[khaeru]

@glatterf42 any idea why we're seeing two instances of each of the Codecov checks?

[glatterf42]

Not really. I think I did a git commit --fixup and rebase locally while the tests started running and force pushed it immediately, so maybe that confused the GitHub runners. If that's the case, we should not see it anymore :)