Update scalafmt-core to 2.6.1

[BenFradet]

Update scalafmt-core to 2.6.1

[codecov]

Codecov Report

Merging #516 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #516   +/-   ##
=======================================
  Coverage   90.45%   90.45%           
=======================================
  Files          24       24           
  Lines         618      618           
  Branches        1        1           
=======================================
  Hits          559      559           
  Misses         59       59           

Impacted Files	Coverage Δ
github4s/src/main/scala/github4s/Decoders.scala	91.04% <ø> (ø)

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