upgrade go-github dep to v68

[cfryanr]

Release note:

NONE

[netlify]

✅ Deploy Preview for pinniped-dev canceled.

Name	Link
🔨 Latest commit	f040f09
🔍 Latest deploy log	https://app.netlify.com/sites/pinniped-dev/deploys/6786b5684c9a640008463473

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.97%. Comparing base (3d2446d) to head (f040f09).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2184   +/-   ##
=======================================
  Coverage   31.96%   31.97%           
=======================================
  Files         379      379           
  Lines       62113    62113           
=======================================
+ Hits        19857    19859    +2     
+ Misses      41726    41724    -2     
  Partials      530      530           

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