Clean up GitHubApiAlg and Http4sGitHubApiAlg

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #290 into master will increase coverage by 0.39%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
+ Coverage   49.28%   49.67%   +0.39%     
==========================================
  Files          54       54              
  Lines         629      624       -5     
  Branches       27       28       +1     
==========================================
  Hits          310      310              
+ Misses        319      314       -5

Impacted Files	Coverage Δ
...alasteward/core/dependency/DependencyService.scala	0% <ø> (ø)	⬆️
...teward/core/github/http4s/Http4sGitHubApiAlg.scala	0% <0%> (ø)	⬆️
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	0% <0%> (ø)	⬆️
...la/org/scalasteward/core/github/GitHubApiAlg.scala	100% <100%> (ø)	⬆️

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