Go mod tidy sourcegraph

[sourcegraph-bot]

This is a campaign run to fulfill the delivery plan https://github.com/sourcegraph/customer/issues/13.

Over the coming days, I will update more repositories using go mod tidy.
Find this campaign here

[eseliger]

Approving, as we had approval here: #40 and this is just the same content, only recreated from the k8s cluster rather than a local Sourcegraph instance.

[codecov]

Codecov Report

Merging #41 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   26.91%   26.91%           
=======================================
  Files           5        5           
  Lines        1133     1133           
=======================================
  Hits          305      305           
  Misses        784      784           
  Partials       44       44           

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