Revert "Update plugins.sbt"

This reverts commit 8a9c3c5.

Author: pjfanning

project/plugins.sbt

@@ -4,6 +4,6 @@ addSbtPlugin("org.typelevel" % "sbt-typelevel-sonatype-ci-release" % "0.5.0-M6")
 
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.11")
 
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.6.0")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 
 addSbtPlugin("io.github.siculo" %% "sbt-bom" % "0.3.0")