Remove broken 'author' parameter in Bamboo create_comment

[StardustGogeta]

The Bamboo create_comment function does not work, returning an error that the author field is unrecognized and invalid. The field should be removed to fix the behavior.

We can also see that the author field is not present in the documented API, linked below:
https://developer.atlassian.com/server/bamboo/rest/api-group-api/#api-api-latest-result-projectkey-buildkey-buildnumber-comment-post

Making this change allows posting comments, as expected.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.37%. Comparing base (d2fd7fa) to head (37868a2).
Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1407   +/-   ##
=======================================
  Coverage   34.37%   34.37%           
=======================================
  Files          46       46           
  Lines        8585     8585           
  Branches     1601     1601           
=======================================
  Hits         2951     2951           
  Misses       5511     5511           
  Partials      123      123           

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