fix: Not copied case & response inside Case.validate_response

[Stranger6667]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1438 (feb3179) into master (47746e3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1438   +/-   ##
=======================================
  Coverage   99.12%   99.12%           
=======================================
  Files          86       86           
  Lines        6604     6606    +2     
  Branches     1155     1155           
=======================================
+ Hits         6546     6548    +2     
  Misses         30       30           
  Partials       28       28           

Impacted Files	Coverage Δ
src/schemathesis/models.py	99.06% <100.00%> (+<0.01%)	⬆️

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