MNT: Require cloudpickle >= 2.0

[effigies]

Acknowledgment

• I acknowledge that this contribution will be available under the Apache 2 license.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

Closes #457.

Checklist

• All tests passing
• I have added tests to cover my changes
• I have updated documentation (if necessary)
• My code follows the code style of this project
  (we are using black: you can pip install pre-commit,
  run pre-commit install in the pydra directory
  and black will be run automatically with each commit)

[codecov]

Codecov Report

Merging #517 (07566cc) into master (13dc5ea) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #517   +/-   ##
=======================================
  Coverage   78.89%   78.89%           
=======================================
  Files          20       20           
  Lines        4326     4326           
  Branches     1211     1211           
=======================================
  Hits         3413     3413           
  Misses        721      721           
  Partials      192      192           

Flag	Coverage Δ
unittests	78.82% <ø> (ø)

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