Update sbt-scalafmt to 2.6.0

Author: scala-steward

project/plugins.sbt

@@ -6,7 +6,7 @@ addSbtPlugin("org.scala-js"       % "sbt-scalajs"                   % "1.21.0")
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject"      % "1.3.2")
 addSbtPlugin("org.scala-native"   % "sbt-scala-native"              % "0.5.11")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
-addSbtPlugin("org.scalameta"      % "sbt-scalafmt"                  % "2.5.6")
+addSbtPlugin("org.scalameta"      % "sbt-scalafmt"                  % "2.6.0")
 addSbtPlugin("org.scalameta"      % "sbt-mdoc"                      % "2.4.0")
 
 scalacOptions += "-deprecation"