fix incorrect content-type for multipart-uploaded objects.

[Robothy]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.43%. Comparing base (02f5527) to head (1900034).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #90   +/-   ##
=========================================
  Coverage     89.43%   89.43%           
  Complexity     1016     1016           
=========================================
  Files           193      193           
  Lines          3578     3578           
  Branches        197      197           
=========================================
  Hits           3200     3200           
  Misses          277      277           
  Partials        101      101           

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