update adobe campaign gem to use new auth method

[andrewroth]

No description provided.

[stage-branch-merger]

I see you added the "On Staging" label, I'll get this merged to the staging branch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (ef91634) to head (8ef31e9).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #166   +/-   ##
=======================================
  Coverage   96.27%   96.27%           
=======================================
  Files          28       28           
  Lines         483      483           
=======================================
  Hits          465      465           
  Misses         18       18           

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[andrewroth]

I've tested this in staging and it works.