deps(dd-trace-cpp): bump to bf584d20

[dmehala]

Fix #231 dependency on a dd-trace-cpp branch. This bump dd-trace-cpp to bf584d20.

Close #233

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.86%. Comparing base (c69ec65) to head (9be9fbf).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   70.86%   70.86%           
=======================================
  Files          51       51           
  Lines        6457     6457           
  Branches      918      918           
=======================================
  Hits         4576     4576           
  Misses       1435     1435           
  Partials      446      446           

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