fix: correct content-type for Postman API export

[tangcent]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.475%. Comparing base (ce41396) to head (a4103db).

Additional details and impacted files

@@               Coverage Diff               @@
##              master      #546       +/-   ##
===============================================
- Coverage     63.491%   63.475%   -0.016%     
+ Complexity      2014      2011        -3     
===============================================
  Files            223       224        +1     
  Lines          10622     10620        -2     
  Branches        2580      2581        +1     
===============================================
- Hits            6744      6741        -3     
- Misses          2538      2539        +1     
  Partials        1340      1340               

Flag	Coverage Δ
unittests	63.475% <100.000%> (-0.016%)	⬇️

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Files	Coverage Δ
...c/main/kotlin/com/itangcent/http/RawContentType.kt	100.000% <100.000%> (ø)
...ugin/api/export/postman/DefaultPostmanApiHelper.kt	69.262% <100.000%> (ø)
...ea/plugin/api/export/postman/PostmanApiExporter.kt	32.432% <ø> (ø)

... and 3 files with indirect coverage changes

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