Update sbt-scalafmt to 2.6.0 (#1753)

Co-authored-by: Muki Seiler <muuki88@users.noreply.github.com>

Author: scala-steward

project/plugins.sbt

@@ -10,7 +10,7 @@ libraryDependencies += "org.scala-sbt" %% "scripted-plugin" % sbtVersion.value
 libraryDependencies += "jline" % "jline" % "2.14.6"
 
 // For code formatting
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.6")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.6.0")
 
 // binary compatibility checks
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.4")