Remove dill dependency

[renatomello]

Closes #1267

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (66252b6) to head (33a4858).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1270      +/-   ##
==========================================
- Coverage   99.94%   99.85%   -0.09%     
==========================================
  Files          73       73              
  Lines       10638    10638              
==========================================
- Hits        10632    10623       -9     
- Misses          6       15       +9     

Flag	Coverage Δ
unittests	99.85% <ø> (-0.09%)	⬇️

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