fix: generate correct response for text/plain content type

[mrlubos]

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🦋 Changeset detected

Latest commit: bc66cde

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@hey-api/openapi-ts	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.31%. Comparing base (b463bbf) to head (bc66cde).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1594   +/-   ##
=======================================
  Coverage   56.31%   56.31%           
=======================================
  Files         158      158           
  Lines       24803    24803           
  Branches     1812     1812           
=======================================
  Hits        13969    13969           
  Misses      10824    10824           
  Partials       10       10           

Flag	Coverage Δ
unittests	56.31% <100.00%> (ø)

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commit: bc66cde