Unpin cloudpickle

[gitanshu]

closes #1882

tensorflow/probability 0.11.1 is out which allows compatibility with cloudpickle >= 1.3, so we don't need to pin it anymore

[codecov[bot]]

Codecov Report

Merging #2133 into master will decrease coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2133      +/-   ##
==========================================
- Coverage   93.20%   93.17%   -0.03%     
==========================================
  Files         194      194              
  Lines       10519    10519              
  Branches     1321     1321              
==========================================
- Hits         9804     9801       -3     
- Misses        474      475       +1     
- Partials      241      243       +2     

Impacted Files	Coverage Δ
...rage/tf/optimizers/conjugate_gradient_optimizer.py	81.90% <0.00%> (-1.81%)	:arrow_down:
src/garage/experiment/deterministic.py	90.32% <0.00%> (+3.22%)	:arrow_up:

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[gitanshu]

Does this need to be backported?

I'd say it's good to backport. We managed to resolve the other conflicts but pinning cloudpickle still conflicts with dask.distributed > 2.20.0

[gitanshu]

@mergifyio rebase

[mergify[bot]]

Command rebase: success

Branch already up to date