Django middleware error response validation fix

[p1c2u]

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[codecov]

Codecov Report

Merging #361 (7c1824d) into master (98c0682) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #361   +/-   ##
=======================================
  Coverage   96.66%   96.66%           
=======================================
  Files          80       80           
  Lines        1739     1739           
=======================================
  Hits         1681     1681           
  Misses         58       58           

Impacted Files	Coverage Δ
openapi_core/contrib/django/middlewares.py	97.43% <100.00%> (+5.12%)	⬆️
openapi_core/templating/responses/exceptions.py	90.00% <0.00%> (-10.00%)	⬇️
openapi_core/unmarshalling/schemas/exceptions.py	92.85% <0.00%> (-3.58%)	⬇️

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