Fix Git.CreateTag test error message

[atakanozceviz]

No description provided.

[google-cla]

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[gmlewis]

Thank you, @atakanozceviz !
LGTM.

Awaiting signed CLA before merging.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (2b8c7fa) to head (eb602c4).
Report is 198 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3385      +/-   ##
==========================================
- Coverage   97.72%   92.21%   -5.51%     
==========================================
  Files         153      173      +20     
  Lines       13390    14770    +1380     
==========================================
+ Hits        13085    13620     +535     
- Misses        215     1060     +845     
  Partials       90       90              

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