Update to latest holoviz_tasks

[hoxbro]

The changes in the install task are caching when a test fails. Beforehand, it will only do so if the test passed.

The other change is saving the environment files from the different runs, making debugging easier.

You can get the environment files here: https://github.com/holoviz/datashader/actions/runs/6309708107?pr=1281 under artifacts.

[codecov]

Codecov Report

Merging #1281 (38a85c2) into main (3dab9df) will decrease coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1281      +/-   ##
==========================================
- Coverage   83.54%   83.52%   -0.03%     
==========================================
  Files          35       35              
  Lines        9134     9145      +11     
==========================================
+ Hits         7631     7638       +7     
- Misses       1503     1507       +4     

see 1 file with indirect coverage changes

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[ianthomas23]

Thanks, this looks really useful.