Use Attempt<Str> as source of temporary files

[Baptouuuu]

This method is mainly used in innmind/amqp to create files coming from the socket. The type returned from the socket should be an Attempt<Str> hence the change.

And if someone still use Maybes they can call ->attempt() on it to make it compatible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.47%. Comparing base (4150f6d) to head (8fbe58c).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #15      +/-   ##
=============================================
+ Coverage      91.46%   91.47%   +0.01%     
  Complexity       126      126              
=============================================
  Files             21       21              
  Lines            972      974       +2     
=============================================
+ Hits             889      891       +2     
  Misses            83       83              

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