fix: Properly label a path template issue as a warning (#494). Thanks @chamini2!

[dbanty]

Fixes #494

[codecov]

Codecov Report

Merging #502 (08e0179) into main (2d4365c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #502   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         1610      1610           
=========================================
  Hits          1610      1610           

Impacted Files	Coverage Δ
openapi_python_client/parser/openapi.py	100.00% <ø> (ø)

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