Update scalafmt-core to 2.6.4#79

scala-steward wants to merge 1 commit intohuiwang:masterhuiwang/codingame-scala-kit:masterfrom

scala-steward:update/scalafmt-core-2.6.4scala-steward/codingame-scala-kit:update/scalafmt-core-2.6.4Copy head branch name to clipboard