adapt to Flux v0.16

[CarloLucibello]

supersedes #658 #663

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.60%. Comparing base (62ec930) to head (0bea861).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
==========================================
- Coverage   97.60%   97.60%   -0.01%     
==========================================
  Files         112      112              
  Lines        5592     5588       -4     
==========================================
- Hits         5458     5454       -4     
  Misses        134      134              

Flag	Coverage Δ
DI	98.75% <ø> (ø)
DIT	95.35% <100.00%> (-0.01%)	⬇️

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[CarloLucibello]

wait before merge, I'll adapt this to Flux v0.16

[gdalle]

I was about to ask you, that would be lovely thanks

[CarloLucibello]

@gdalle ready to go