Update scalafmt-core to 3.7.15#171

scala-steward wants to merge 3 commits intoThoughtWorksInc:3.3.xThoughtWorksInc/each:3.3.xfrom

scala-steward:update/scalafmt-core-3.7.15scala-steward/each:update/scalafmt-core-3.7.15Copy head branch name to clipboard