Update go-gitlab

[lkysow]

Closes #1142

[codecov]

Codecov Report

Merging #1144 into master will decrease coverage by 0.00%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master    #1144      +/-   ##
==========================================
- Coverage   71.17%   71.17%   -0.01%     
==========================================
  Files          71       71              
  Lines        5888     5894       +6     
==========================================
+ Hits         4191     4195       +4     
- Misses       1348     1349       +1     
- Partials      349      350       +1     

Impacted Files	Coverage Δ
server/events/vcs/gitlab_client.go	40.94% <63.63%> (+1.27%)	⬆️

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