Fixed some unused properties in tests that deepsource complained about

[emann]

No description provided.

[codecov]

Codecov Report

Merging #156 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main      #156    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           10        41    +31     
  Lines          670      1253   +583     
==========================================
+ Hits           670      1253   +583     

Impacted Files	Coverage Δ
openapi_python_client/parser/reference.py	100.00% <ø> (ø)
openapi_python_client/__init__.py	100.00% <100.00%> (ø)
openapi_python_client/cli.py	100.00% <100.00%> (ø)
openapi_python_client/config.py	100.00% <100.00%> (ø)
openapi_python_client/parser/__init__.py	100.00% <100.00%> (ø)
openapi_python_client/parser/errors.py	100.00% <100.00%> (ø)
openapi_python_client/parser/openapi.py	100.00% <100.00%> (ø)
openapi_python_client/parser/properties.py	100.00% <100.00%> (ø)
openapi_python_client/parser/responses.py	100.00% <100.00%> (ø)
openapi_python_client/schema/__init__.py	100.00% <100.00%> (ø)
... and 64 more

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