Fix CI

[maleadt]

As far as I can see, there seems to be an issue with the GitHub API. Even though the GitHub.jl top commit most definitely has some GitHub Actions-generated statuses attached to it, the API returns nothng:

❯ gh api /repos/JuliaWeb/GitHub.jl/commits/master/statuses
[]

❯ gh api /repos/JuliaLang/julia/commits/master/statuses
[
  {
    "url": "https://api.github.com/repos/JuliaLang/julia/statuses/3200219b1f7e2681ece9e4b99bda48586fab8a93",
...

i.e. not an issue with GitHub.jl, as this is the officla gh binary.

As the API does seem to work fine with the Julia repo, I've temporarily switched those tests over to using a commit from there.

[maleadt]

cc @logankilpatrick @quinnj for review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.87%. Comparing base (6271289) to head (b8f78c9).
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #203      +/-   ##
==========================================
- Coverage   56.19%   55.87%   -0.32%     
==========================================
  Files          35       36       +1     
  Lines         840      843       +3     
==========================================
- Hits          472      471       -1     
- Misses        368      372       +4     

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