Fix bug in inputs checksum before/after task run when deeply modifying objects

[tclose]

Types of changes

• Bug fix

Summary

Deep copy original inputs when saving to restore after task has been run, primarily so that checksum doesn't change after the task has been run (making the node undiscoverable by downstream nodes)

Checklist

• I have added tests to cover my changes (if necessary): N/A
• I have updated documentation (if necessary): N/A

[codecov]

Codecov Report

Base: 77.06% // Head: 77.06% // No change to project coverage 👍

Coverage data is based on head (3219549) compared to base (5f5044d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #571   +/-   ##
=======================================
  Coverage   77.06%   77.06%           
=======================================
  Files          20       20           
  Lines        4316     4316           
  Branches     1212     1213    +1     
=======================================
  Hits         3326     3326           
  Misses        802      802           
  Partials      188      188           

Flag	Coverage Δ
unittests	76.96% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pydra/engine/core.py	88.97% <100.00%> (ø)

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