chore: Deep-clone Response instances before passing to check functions

[Stranger6667]

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[codecov-commenter]

Codecov Report

Merging #1420 (5b27f77) into master (c5a691f) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1420      +/-   ##
==========================================
- Coverage   99.16%   99.07%   -0.10%     
==========================================
  Files          84       84              
  Lines        6476     6487      +11     
  Branches     1137     1138       +1     
==========================================
+ Hits         6422     6427       +5     
- Misses         27       30       +3     
- Partials       27       30       +3     

Flag	Coverage Δ
unittests	99.07% <100.00%> (-0.07%)	⬇️

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Impacted Files	Coverage Δ
src/schemathesis/runner/impl/core.py	97.87% <100.00%> (+0.06%)	⬆️
src/schemathesis/runner/impl/threadpool.py	98.23% <0.00%> (-1.77%)	⬇️
src/schemathesis/extra/pytest_plugin.py	98.24% <0.00%> (-1.76%)	⬇️
src/schemathesis/cli/callbacks.py	98.33% <0.00%> (-1.67%)	⬇️

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